The Japanese Penal Code — Overview

Introduction

The Penal Code (Keihō, Act No. 45 of 1907, effective 1 October 1908) is Japan’s principal criminal statute. It replaced the “Old Penal Code” (Kyū Keihō) of 1880, which had been drafted under French influence by Gustave Boissonade. The 1907 Code adopted a German-oriented structure and approach while incorporating distinctive features that reflect Japan’s legal traditions. The Code has been extensively amended, most notably in 1995 (the language modernisation), 2004–2007 (the revision of sexual offences), 2017 (the introduction of the conspiracy offence and the reform of sexual offences), and 2023 (the raising of the age of consent and the redefinition of sexual offences as non-consensual rather than forcible).

The Penal Code is organised into a General Part (Sōsoku, Articles 1–72) and a Special Part (Kakusoku, Articles 73–264). The General Part sets out the scope of application, the forms of punishment, the general conditions of criminal liability, and the rules on attempt, participation, and merger of offences. The Special Part defines specific crimes.

General Part

Scope of Application. The Penal Code applies under four principles: territorial (Article 1 — offences committed wholly or partly within Japan), personal (Article 3 — certain offences by Japanese nationals abroad), protective (Article 2 — certain offences against the state by any person, wherever committed), and universal (Article 4-2 — certain international crimes such as piracy).

Punishment. The Code provides for a graduated system of sanctions (Articles 9–19). The death penalty (shikei, Article 11: hanging), imprisonment with labour for life (chōki chōeki) and for a fixed term (yūki chōeki, Article 12: one month to 20 years, extendable to 30 years for aggravated recidivism), imprisonment without labour (kinko), fines (bakkin: ¥10,000 or more), misdemeanour detention (kōryō: one to 30 days), and petty fines (ryōkin: ¥1,000 to ¥9,999). Suspension of sentence (shikkō yūyo) and parole (kari shakkō) are available under the Criminal Procedure Code.

Elements of Crime. The General Part adopts the German-inspired three-stage structure of criminal liability: (1) the Tatbestand (the constituent elements of the offence: conduct, result, causation, and mens rea), (2) Rechtswidrigkeit (unlawfulness: the absence of justifications), and (3) Schuld (culpability: the actor’s blameworthiness).

Causation is assessed under a “reasonable foreseeability” test. The leading case is Fukuoka Nichin-geki Jiken (Supreme Court, 1990), in which the Court held that a causal nexus exists if the defendant’s conduct was a “necessary condition” of the result and the result was within the scope of ordinary foreseeability.

Intent and Negligence. The Code distinguishes between intentional (kokui) and negligent (kashitsu) conduct. Intent requires knowledge and will; conditional intent (kakutei-teki ni hairanai kokui) suffices where the actor is indifferent to the consequences. Negligence is penalised only where the Special Part expressly provides (e.g., negligent homicide under Article 209).

Defences. The General Part recognises self-defence (seitō bōei, Article 36: the minimum necessary force to repel an imminent unjust attack), necessity (hijō shiyō, Article 37: harm caused to avert an imminent danger, provided the harm does not exceed the harm averted), insanity (seishin shōgai, Article 39(1): not punishable), diminished capacity (Article 39(2): sentence reduced), mistake of law (generally no defence, but the Supreme Court recognises limited exceptions), and mistake of fact (negates intent).

Special Part

Crimes Against the State. Articles 73–82 define crimes against the state, including insurrection (bōdō), rioting, and treason. The “crime of the Emperor” (Article 73: conspiracy to harm the Emperor or the Imperial family) was repealed in 1947 following the adoption of the post-war Constitution.

Crimes Against Public Order. Articles 95–117 cover obstruction of public authority, arson (hōka, Article 108), flooding, and damage to public infrastructure.

Crimes Against the Person. Homicide is governed by Article 199, which sets a uniform penalty of death, life imprisonment, or imprisonment for a fixed term of at least five years for killing another person. The Code does not divide homicide into degrees; the court determines the severity of the sentence based on the circumstances, including premeditation, cruelty, and motive.

Assault and Bodily Injury. Assault (bōkō, Article 208) and bodily injury (shōgai, Articles 204–205) are separate offences. Injury resulting in death carries a penalty of imprisonment for a fixed term of at least three years (Article 205).

Sexual Offences. Sexual offences were substantially reformed in 2017 and again in 2023. The 2023 amendments (effective 13 July 2023) raised the age of consent from 13 to 16, redefined the core sexual offence as “non-consensual sexual intercourse” (igōi-sei kōi) rather than “forcible sexual intercourse,” and introduced a list of circumstances in which consent is deemed absent (such as the use of violence or intimidation, the exploitation of a position of authority, and the administration of drugs or alcohol). The new provisions also expanded the definition of sexual assault to include acts other than sexual intercourse.

Kidnapping. Articles 224–228 criminalise kidnapping for the purpose of personal gain, for ransom, or for transportation out of the country.

Crimes of Property. Theft (settō, Article 235), robbery (gōtō, Articles 236–239), fraud (sagi, Article 246), embezzlement (ōryō, Articles 252–254), and blackmail (kyōhaku, Article 249) are the principal property offences. The Code distinguishes between the taking of property (theft), the taking by force or threat (robbery), and the acquisition by deception (fraud).

The Death Penalty

The death penalty is carried out by hanging (Article 11). The Minister of Justice signs the execution warrant within six months of the finalisation of the sentence, though in practice executions may be delayed for many years. Japan executed approximately 100 prisoners between 2000 and 2020. The rate of execution has declined under recent administrations. The 2010 Act on the Execution of the Death Penalty introduced procedural improvements, including the requirement of a mandatory review of the sentence before execution.

Reform Trajectory

The Penal Code has been repeatedly amended to respond to social change and international obligations. The 1995 reform modernised the language from Classical Chinese to modern Japanese. The 2004–2007 reforms responded to rising public concern about violent crime. The 2017 and 2023 reforms addressed sexual offences in the context of the #MeToo movement and international human rights standards. The 2017 introduction of a conspiracy offence (Article 6-2, criminalising the agreement to commit certain serious offences) was controversial but was adopted to implement the United Nations Convention against Transnational Organized Crime.

Relationship with Other Criminal Legislation

The Penal Code is supplemented by a large number of special criminal statutes, including the Act on the Punishment of Violence (Bōryoku Kōi nado Shobatsu ni Kansuru Hōritsu), the Act on the Punishment of Crimes Affecting National Security (the “Subversive Activities Prevention Act”), and the Act on the Control of Narcotics and Psychotropics. The Act on Prevention of Spousal Violence and Protection of Victims (Haigūsha kara no Bōryoku no Bōshi oyobi Higaisha no Hogo ni Kansuru Hōritsu) and the Act on Punishment of Stalking provide specialised protections.

The Supreme Court’s constitutional jurisprudence — particularly on Article 36 of the Constitution (prohibition of cruel punishments) and Article 31 (due process) — provides an overarching framework that limits the reach of the Penal Code and shapes its interpretation.