Actus reus
Latin: Guilty act
Also called: Physical element of crime, Guilty act
The physical or external element of a crime: the conduct (act or illegal omission), with its circumstances and consequences, that the law forbids.
Explained
Actus reus means the guilty act. It is the external element of an offence, as distinct from mens rea, the guilty mind. The two are drawn from the maxim actus non facit reum nisi mens sit rea, an act does not make a person guilty unless the mind is also guilty. Ordinarily criminal liability requires both, occurring together.
The actus reus has three possible components: conduct, which may be an act or an omission; the circumstances that make the conduct criminal; and, for result crimes such as murder or hurt, a consequence caused by the conduct. The conduct must be voluntary in the sense of being willed, and the consequence must be legally caused by it.
The Bharatiya Nyaya Sanhita, 2023 does not use the term, but its definitions supply the content. 'Act' denotes a series of acts as well as a single act (Section 2(1)), and 'omission' a series of omissions as well as a single omission (Section 2(25)). Section 3(4) provides that, unless a contrary intention appears, words referring to acts done extend also to illegal omissions, carrying forward Section 32 of the IPC. 'Illegal' under Section 2(15) covers everything that is an offence, prohibited by law or furnishing ground for a civil action, so an omission is punishable only where there is a legal duty to act. Each offence's definition then specifies its own actus reus, such as moving movable property out of a person's possession in theft.
The concept is applied to statutory offences as well. In Just Rights for Children Alliance v. S. Harish (2024) the Supreme Court explained that, where child sexual exploitative material is in a person's constructive possession, the failure or omission to report it constitutes the actus reus for Section 15(1) of the POCSO Act. Examiners test the meaning of the term in match-the-following questions, its pairing with mens rea, and liability for illegal omissions.
What the law says
In this Sanhita, unless the context otherwise requires,––
(1) “act” denotes as well a series of acts as a single act;
(2) “animal” means any living creature, other than a human being;
Defines act (2(1)), omission (2(25)) and illegal (2(15))
Earlier law: IPC 33. “Act”. “Omission”; 47. “Animal”.; New Sub-Section; 28. “Counterfeit”.; 20. “Court of Justice”.; 46. “Death”.; 24. “Dishonestly”.; 29. “Document”.; 25. “Fraudulently”; 8. Gender.; 52. “Good faith”; 17. “Government”.; 52A. “Harbour“.; 44. “Injury”.; 43. “Illegal”. “Legally bound to do”.; 19. “Judge”.; 45. “Life”.; 42. “Local law”.; 10. “Man”. “Woman”.; 49. “Year”. “Month”.; 22. “Movable property”; 9. Number.; 51. “Oath”.; 40. “Offence”.; 33. “Act”. “Omission”; 11. “Person”.; 12. “Public”.; 21. “Public servant”.; 26. “Reason to believe”
(1) Throughout this Sanhita every definition of an offence, every penal provision, and every Illustration of every such definition or penal provision, shall be understood subject to the exceptions contained in the Chapter entitled “General Exceptions”, though those exceptions are not repeated in such definition, penal provision, or Illustration.
Illustrations.
(a) The sections in this Sanhita, which contain definitions of offences, do not express that a child under seven years of age cannot commit such offences; but the definitions are to be understood subject to the general exception which provides that nothing shall be an offence which is done by a child under seven years of age.
Section 3(4): acts include illegal omissions
Earlier law: IPC 6. Definitions in the Code to be understood subject to exceptions.; 7. Sense of expression once explained.; 27. Property in possession of wife, clerk or servant.; 32. Words referring to acts include illegal omissions.; 34. Acts done by several persons in furtherance of common intention.; 35. When such an act is criminal by reason of its being done with a criminal knowledge or intention.; 36. Effect caused partly by act and partly by omission.; 37. Co-operation by doing one of several acts constituting an offence.; 38. Persons concerned in criminal act may be guilty of different offences.
Earlier law: Section 32, IPC
Example
For example, in theft the actus reus is moving movable property out of another's possession without consent; the dishonest intention to take it is the mens rea. A person who carries away another's umbrella believing it to be his own commits the act but lacks the mens rea.
For the exam
- Actus reus is the physical element; mens rea is the mental element.
- Components: conduct (act or omission), circumstances and, for result crimes, consequence.
- Words referring to acts extend to illegal omissions (Section 3(4) BNS; earlier Section 32 IPC).
- An omission is criminal only where there is a legal duty to act.
- Just Rights for Children (2024): failure to report possessed material is the actus reus under Section 15(1) POCSO.
11 questions in the Law Maker question bank use this maxim. Practise Legal Maxims & Jurisprudence questions
Judgments
Related terms
- Mens reaThe mental element of a crime, such as intention, knowledge, dishonesty or rashness, which together with the physical act (actus reus) ordinarily constitutes an offence.
- Actus non facit reum nisi mens sit reaThe act alone does not make a person guilty; criminal liability ordinarily requires a guilty act (actus reus) accompanied by a guilty mind (mens rea).
- OmissionA failure to act. Under Section 2(25) of the BNS the word denotes a series of omissions as well as a single omission, and words referring to acts extend to illegal omissions.
- OffenceAn act or omission made punishable by law. The BNS core meaning is a thing made punishable by the Sanhita; the BNSS meaning covers any law in force.
- Corpus delictiThe substance of an offence: proof that the crime charged was in fact committed by someone. In homicide it is often equated with the dead body, but its recovery is not essential to a conviction.
Further reading
Checked 6 November 2026. Statutory text is quoted from the Bare Acts library, taken from India Code. See the full glossary.