Maritime Law in Japan
The Sources of Japanese Maritime Law
Japanese maritime law is principally codified in Book II, Part IX of the Commercial Code (Shoho, Law No. 48 of 1899, extensively amended), which bears the title “Maritime Commerce” (Kaisho). The Commercial Code provisions on maritime commerce (Articles 684–852) address the principal institutions of private maritime law: the shipowner, the master, the carriage of goods and passengers by sea, general average, collision, salvage, marine insurance, and maritime liens. These provisions have been supplemented and, in significant respects, displaced by Japan’s participation in the international maritime convention framework, including the International Convention for the Unification of Certain Rules of Law relating to Bills of Lading (the Hague-Visby Rules), the International Convention on Salvage (1989), and the International Convention on Limitation of Liability for Maritime Claims (LLMC 1976), among others.
Japan is a party to the major maritime conventions administered by the International Maritime Organization (IMO), of which Japan has been a member since the IMO’s establishment in 1958 and in which it has exercised substantial influence as a major shipowning and shipbuilding nation. The conventions are given domestic effect through implementing legislation — the Act on Limitation of Liability of Shipowners (Senshu Sekinin Seigen Ho), the Act on Prevention of Marine Pollution and Maritime Disasters (Kaiyo Osen Boushi Ho), and others — that typically reproduces the convention text with limited modifications to accommodate Japanese procedural law.
Shipowner Liability and Limitation
The liability of the shipowner under Japanese law is governed by a combination of the Commercial Code and the Act on Limitation of Liability of Shipowners (Law No. 151 of 1960, as amended). The Commercial Code (Article 687) provides that the shipowner is liable for damages caused by the fault of the master, the crew, the pilot, or other persons employed in the navigation or management of the ship. This liability is vicarious in character: the shipowner is answerable for the negligence of those under his direction, regardless of the owner’s personal fault.
The limitation of liability system follows the 1976 Limitation Convention (LLMC), which Japan ratified in 1977. Under the Convention as implemented, the shipowner (and the salvor) may limit liability for certain categories of claims — loss of life or personal injury, loss of or damage to property, and claims for delay — to an amount calculated by reference to the vessel’s tonnage. The limits are expressed in Special Drawing Rights (SDRs) of the International Monetary Fund: for a ship of not more than 2,000 gross tonnage, the limit for personal injury claims is SDR 2 million (approximately ¥330 million at 2025 exchange rates); for larger vessels, additional amounts are calculated on a sliding scale. The right to limit is forfeited only if it is proved that the loss resulted from the “personal act or omission of the shipowner committed with the intent to cause such loss, or recklessly and with knowledge that such loss would probably result” — a standard that Japanese courts have interpreted strictly, denying limitation in only the most egregious cases of deliberate misconduct.
Carriage of Goods by Sea
The carriage of goods by sea under Japanese law is governed by the Commercial Code (Articles 737–776) as modified by Japan’s adoption of the Hague-Visby Rules. Japan acceded to the Hague Rules in 1957 and to the Visby Protocol in 1975; the combined Hague-Visby regime applies to all outward shipments from Japanese ports and, by virtue of the COGSA-type “paramount clause” inserted into most Japanese bills of lading, to inward shipments as well.
The carrier’s obligations under the Hague-Visby regime include the duty to exercise due diligence to make the ship seaworthy before and at the beginning of the voyage (Article III, Rule 1), the duty to properly and carefully load, handle, stow, carry, keep, care for, and discharge the goods (Article III, Rule 2), and the duty to issue a bill of lading on demand (Article III, Rule 3). The carrier benefits from the catalogue of exemptions in Article IV, Rule 2, including the controversial “nautical fault” defence — immunity for loss or damage resulting from “act, neglect, or default of the master, mariner, pilot, or the servants of the carrier in the navigation or in the management of the ship.”
Japanese courts have interpreted the Hague-Visby Rules in a manner generally consistent with international jurisprudence, though with some distinctive features. Japanese decisions have emphasised the non-delegable character of the carrier’s duty to exercise due diligence to make the ship seaworthy, holding that the carrier cannot avoid liability by entrusting the pre-voyage inspection to a reputable classification society or independent surveyor. The Supreme Court’s judgment in the Asia Maru Case (1978) established that the burden of proving due diligence lies on the carrier and that the duty extends to ensuring that the vessel’s crew is competent and properly qualified — a standard that reflects Japan’s experience as a major maritime nation with a strong tradition of maritime education and training.
The bill of lading (tegata or shofun jokyo) in Japanese practice serves the three classical functions recognised in Anglo-American and civil law systems: evidence of the contract of carriage, receipt for the goods, and document of title. The Commercial Code (Article 776) provides that the holder of a bill of lading is entitled to delivery of the goods and that the carrier who delivers goods without production of the bill of lading does so at his own risk. Japanese courts have applied this provision strictly, holding carriers liable for misdelivery even where the goods were delivered in good faith to a person who produced the bill through forged endorsement.
Marine Insurance
Marine insurance in Japan is governed by the Insurance Act (Hoken Ho, Law No. 56 of 2008), which replaced the Commercial Code provisions on insurance and brought Japanese insurance law into closer alignment with international practice. The Insurance Act distinguishes between cargo insurance (kasai hoken) and hull insurance (senpaku hoken), though the general principles applicable to both are substantially the same.
The Insured must disclose all material facts known to him at the time of contracting (the duty of utmost good faith), and concealment or misrepresentation of a material fact entitles the insurer to avoid the contract (Article 28 of the Insurance Act). Japanese courts have interpreted the materiality standard in line with English marine insurance practice: a fact is material if it would influence the judgment of a prudent insurer in determining the premium or whether to accept the risk.
General average is recognised in Japanese law through the Commercial Code (Articles 788–796), which codifies the principle that losses intentionally incurred and expenses voluntarily made for the common safety of the maritime adventure shall be borne proportionally by the parties whose interests are thereby preserved. In practice, Japanese shipping contracts almost invariably incorporate the York-Antwerp Rules (as amended from time to time), and Japanese average adjusters apply the Rules in a manner consistent with international practice. The Japan Association of Average Adjusters (Nippon Songai Chosei Kyokai) issues standard rules and practice notes that are widely followed in the Japanese shipping industry.
Salvage
The law of salvage in Japan is governed by the International Convention on Salvage (1989), which Japan ratified in 1998 and implemented through the Act on Salvage (Kyujo Ho). The Convention’s key provisions — the “no cure, no pay” principle (Article 12), the enhanced salvage award for salvage operations that prevent or minimise damage to the environment (Article 14), and the special compensation regime for environmental salvage (the “SCOPIC” clause) — are fully effective in Japanese law.
Japanese courts have applied the Convention’s criteria for determining the salvage award — the salved value of the vessel and property, the skill and efforts of the salvors, the degree of danger, the time used and expenses incurred — with careful attention to the circumstances of each case. The Tokyo District Court and the Osaka District Court, as the principal maritime jurisdictions, have developed a substantial body of salvage jurisprudence, including decisions on the assessment of environmental salvage awards under Article 14. Japan’s coastal geography — with its narrow straits, heavy traffic separation schemes, and the concentration of port facilities in Tokyo Bay, Ise Bay, and Osaka Bay — has produced a high volume of salvage operations and corresponding litigation.
Ship Mortgages and Maritime Liens
The ship mortgage (senpaku teito) in Japan is governed by the Commercial Code (Articles 848–852) and the Act on Ship Mortgages (Senpaku Teito Ho, Law No. 65 of 1931). A ship mortgage may be created by agreement between the owner and the mortgagee, recorded in the Ship Register (senpaku genjo bo), and, upon default, enforced by judicial sale. The scope of the mortgage extends to the vessel’s appurtenances and, in certain circumstances, to freight and insurance proceeds.
Maritime liens (kaijo yusen token) — privileged claims that attach to the vessel and take priority over ship mortgages — are recognised in Japanese law for a closed catalogue of categories: crew wages, salvage claims, port and canal dues, claims for personal injury and property damage, and claims for loss of life. The priority ranking among these categories follows the international pattern: salvage claims rank highest, followed by crew wages, and then by tort claims. The maritime lien extinguishes after one year from the date of the claim arising, unless the claim is recognised by the court in insolvency proceedings or the vessel is arrested.
Collision of Ships
Maritime collisions (funso) are governed by the tort provisions of the Civil Code (Article 709) supplemented by the Commercial Code (Articles 797–800) and the domestic implementing legislation of the International Regulations for Preventing Collisions at Sea (COLREGS). Japan acceded to the COLREGS in 1977, and the Regulations have the force of law through the Marine Traffic Act and cabinet orders.
The assessment of liability in collision cases follows the proportionate fault principle under Article 797 of the Commercial Code: where both vessels are at fault, each bears liability in proportion to the degree of fault; where the proportion cannot be determined, liability is shared equally. The Japanese courts have developed a sophisticated methodology for apportioning fault in collision cases, examining the conduct of each vessel before, during, and after the collision against the standards of good seamanship prescribed by the COLREGS.
Marine Environmental Protection
Japan’s marine environmental legislation is anchored by the Act on Prevention of Marine Pollution and Maritime Disasters (Kaiyo Osen Boushi Ho, Law No. 136 of 1970), which implements the MARPOL Convention (International Convention for the Prevention of Pollution from Ships). The Act regulates the discharge of oil, noxious liquid substances, sewage, garbage, and air pollutants from ships, establishes penalties for violations, and provides for the designation of Particularly Sensitive Sea Areas (including the Seto Inland Sea, designated as a Special Area under MARPOL Annex V).
Japan is also a party to the International Convention on Civil Liability for Oil Pollution Damage (CLC 1969/1992) and the International Convention on the Establishment of an International Fund for Compensation for Oil Pollution Damage (Fund Convention 1971/1992), implemented through the Act on Liability for Oil Pollution Damage. The Convention regime provides for strict liability of the shipowner, limitation of liability up to the CLC limits, and supplementary compensation from the International Oil Pollution Compensation Fund (IOPC Fund) for claims exceeding the shipowner’s liability.
Jurisdiction and Procedure
The jurisdiction of Japanese courts in maritime matters is exercised by the District Courts (Chiho Saibansho), which have general admiralty jurisdiction. The Tokyo District Court and the Osaka District Court handle the majority of commercial maritime cases, though any district court with territorial jurisdiction over the port where the vessel is arrested or the defendant resides may hear maritime matters.
The arrest of ships in Japan is governed by the Civil Provisional Remedies Act (Minji Hozen Ho, Law No. 91 of 1989), which permits the arrest of a vessel to secure a maritime claim. The applicant must establish a prima facie case for the claim and the necessity for provisional arrest; in practice, Japanese courts grant arrest orders where the applicant demonstrates the existence of a maritime claim and a risk that enforcement of a future judgment would be frustrated. Japan is not a party to the International Convention on Arrest of Ships (1999), but Japanese arrest practice is substantially consistent with the Convention’s provisions.
Japan’s Role in Maritime Regulation
Japan exercises significant influence in international maritime affairs through its membership in the IMO and its role as the host of the Tokyo Memorandum of Understanding on Port State Control. The Tokyo MOU, signed in 1993 and now covering 20 maritime authorities across the Asia-Pacific region, establishes a harmonised system of port State control inspections, including the detention of substandard vessels. Japan, through the Japan Coast Guard and the Ministry of Land, Infrastructure, Transport and Tourism, conducts a robust programme of port State control inspections and maintains one of the lowest detention rates among Tokyo MOU members, reflecting the high quality of the Japanese flag fleet and the effectiveness of the Japanese ship inspection system.