Strict and Absolute Liability in Japanese Law

Introduction

Japanese tort law is founded on the principle of fault-based liability, codified in Article 709 of the Civil Code, which provides that a person who intentionally or negligently infringes another’s rights or legally protected interests is liable for resulting damages. However, the inherent limitations of fault-based liability — particularly the difficulty of proving negligence in complex industrial and technological contexts — have led to the creation of numerous statutory exceptions that impose liability without proof of fault.

These strict and absolute liability regimes are not unified by a single doctrinal framework. Each statute responds to the specific policy considerations of its domain, resulting in a patchwork of regimes that differ in their scope, their defences, and the availability of limitation periods and damage caps.

The General Principle and Its Exceptions

Article 709 of the Civil Code establishes fault as the general basis of tort liability. The plaintiff must prove: (a) the defendant’s intentional or negligent conduct, (b) the infringement of the plaintiff’s right or legally protected interest, (c) causation, and (d) damage. This requirement places a significant burden on plaintiffs, particularly in cases involving complex causation or where the defendant has exclusive control over the information relevant to establishing negligence.

Statutory exceptions to the fault principle have been enacted in contexts where the policy reasons for imposing liability without fault are compelling. These contexts typically involve ultra-hazardous activities, asymmetric information between the plaintiff and defendant, or systemic risks that cannot be adequately managed through fault-based liability.

The Automobile Liability Security Act (1955)

The Automobile Liability Security Act (Jidōsha Songai Baishō Hoshō Hō) imposes strict liability on the operator of a motor vehicle for personal injury or death caused by the operation of the vehicle. The operator is liable regardless of whether the operator was negligent, provided that the injury or death was caused by the operation of the vehicle.

The Act recognises three defences, known collectively as the “three defences” : (1) no defect in the vehicle, (2) no negligence in the operation of the vehicle, and (3) no fault on the part of a third party or the pedestrian. These defences are construed narrowly by the courts, and the operator bears the burden of proving all three. In practice, the defences are almost never established, making the Act a de facto regime of near-absolute liability.

The Act also establishes a compulsory insurance system — all vehicle operators must carry insurance covering the minimum amounts specified by statute — and a government compensation system for victims where the operator cannot be identified or is uninsured.

The Product Liability Act (1994)

The Product Liability Act (Seizōbutsu Baishō Hō) introduced strict liability for manufacturers of defective products. The Act was enacted in response to the rapid advancement of product technology, the increasing complexity of manufacturing processes, and the recognition that fault-based liability under Article 709 placed an insurmountable burden on consumers injured by defective products.

The Act defines a defect as “a lack of safety that the product ordinarily should have, taking into account the nature of the product, the ordinarily foreseeable manner of use, the time of delivery, and other circumstances concerning the product.” This definition encompasses three categories of defect: manufacturing defects, design defects, and warning defects (failure to provide adequate instructions or warnings).

The Act provides the manufacturer with three defences:

• The development risk defence: the defect could not have been discovered given the state of scientific or technical knowledge at the time of delivery
• The component manufacturer defence: the defect was caused by the design of the product as a whole, which was specified by the finished-product manufacturer, and the component manufacturer was not negligent
• The time limit: claims must be brought within ten years of the delivery of the product (or within three years of the date on which the plaintiff knew or ought to have known of the damage and the identity of the manufacturer)

The Act covers all forms of product-related damage, including personal injury, property damage, and economic loss. However, it applies only to products that are commercially manufactured or processed — the Act does not apply to services, software (unless integrated into a tangible product), or natural products that are not industrially processed.

Environmental Liability

The Air Pollution Control Act and the Water Pollution Control Act impose strict liability on industrial operators for pollution-related personal injury and property damage. These statutes reverse the burden of proof — the plaintiff need not prove negligence; it is sufficient to prove that the defendant’s discharge of pollutants into the environment caused the plaintiff’s injury.

The liability of multiple polluters is governed by the principle of joint and several liability under Article 719 of the Civil Code, but the statutes also adopt a proportionality approach for allocating liability among polluters. Each polluter is liable for a share of the total damages proportional to its contribution to the overall pollution, as measured by the quantity and toxicity of the pollutant discharged.

Civil Code Article 717: Dangerous Structures

Article 717 of the Civil Code imposes strict liability on the possessor (and, in the alternative, the owner) of a “structure” (kōzōbutsu) for damage caused by a defect in the construction or maintenance of the structure. A structure is broadly defined to include buildings, roads, bridges, tunnels, dams, and other fixed improvements to land. The liability is strict — the plaintiff need not prove negligence, but the defendant may raise a defence by proving that the defect was not due to any failure in the exercise of reasonable care in the maintenance of the structure.

The Mining Act (1950)

The Mining Act imposes strict liability on mining operators for pollution of water sources, damage to buildings and agricultural land, and subsidence caused by mining operations. The Act establishes a presumption of causation: where damage occurs within a designated area around the mine, it is presumed to have been caused by the mining operation, and the burden shifts to the operator to rebut the presumption.

Nuclear Damage Compensation Act (1961)

The Nuclear Damage Compensation Act establishes a regime of strict and exclusive liability for damage arising from the operation of nuclear facilities. The nuclear operator is strictly liable for all damage caused by a nuclear incident, regardless of whether the operator was negligent. The operator’s liability is exclusive — no action may be brought against the manufacturer of the nuclear equipment, the supplier of nuclear fuel, or any other person involved in the nuclear fuel cycle.

The Act requires nuclear operators to maintain financial security (insurance and indemnity agreements) in the amount specified by government order. Where the damage exceeds the amount of financial security, the government provides indemnification to the victims. The government also provides indemnification for damage caused by nuclear incidents resulting from a grave natural disaster or an insurrection.

The Atomic Energy Act

The Atomic Energy Act supplements the Nuclear Damage Compensation Act by imposing a duty of utmost care on operators of nuclear facilities. The government’s regulatory authority includes the power to order the suspension or closure of nuclear facilities where safety standards are not met.

Conclusion

The strict and absolute liability regimes in Japanese law represent a pragmatic response to the limitations of fault-based liability in addressing the risks of modern industrial society. Each regime reflects a legislative judgment that the activity in question — operating a motor vehicle, manufacturing a product, engaging in mining or nuclear energy — creates risks that should be borne by the operator or manufacturer rather than by the innocent victim. The continued expansion of these regimes, and the narrow construction of the available defences by the courts, suggests that Japanese law is moving steadily toward a more comprehensive system of risk distribution.