Mistake of law - national proceedings

Japan

Japan - Penal Code 1907 (2020) EN/Japanese

PART I. GENERAL PROVISIONS

Chapter VII Actions not Constituting Crimes and Reduction or Remission of Punishment

(Intent)
Article 38
(3) A person Lacking knowledge of law does not mean a lack of intention to commit a crime; provided, however, the punishment may be reduced in light of the circumstances.

Rome Statute

Article 32 Mistake of fact or mistake of law

2. A mistake of law as to whether a particular type of conduct is a crime within the jurisdiction of the Court shall not be a ground for excluding criminal responsibility. A mistake of law may, however, be a ground for excluding criminal responsibility if it negates the mental element required by such a crime, or as provided for in article 33.