Indian Penal Code, 1860 · Chapter IV: General Exceptions
Section 84: Act of a person of unsound mind
The Indian Penal Code, 1860 was repealed and replaced by the Bharatiya Nyaya Sanhita, 2023 from 1 July 2024. It still applies to offences and proceedings from before that date.
In plain words
Nothing is an offence if done by a person who, at the time, because of unsoundness of mind, is incapable of knowing the nature of the act, or that it is wrong or contrary to law.
A simplified explanation, prepared with AI assistance from the official text below and checked automatically against it for numbers and cross-references. The official text is the law and prevails over this summary. Not legal advice.
Official text
Nothing is an offence which is done by a person who, at the time of doing it, by reason of unsoundness of mind, is incapable of knowing the nature of the act, or that he is doing what is either wrong or contrary to law.
Corresponding sections were matched by comparing the wording of both official texts, and for the IPC and BNS, also against a published correspondence table. Wording, punishments and structure often changed, so read both sections before relying on the match.
Source: India Code (Legislative Department), the text of the Act as it stood before its repeal. Words in square brackets [ ] were inserted or substituted by later amending Acts, and *** marks words omitted by an amendment. The amendment footnotes are not reproduced here.
Supreme Court judgments citing the section 84
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Chunni Bai v. State of Chhattisgarh
Whether the accused at the time of commission of crime was incapable of making conscious and informed decision or was suffering from certain mental incapacity or unsoundness of mind; Whether a benefit of doubt may be…
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Rupesh Manger (Thapa) v. State of Sikkim
High Court reversed the order of acquittal of the trial Court and convicted appellant-accused u/s.302 IPC, whether the case of the appellant-accused falls within the exception u/s. 84 of IPC or not.
- Prakash Nayi @ Sen v. State of Goa
- Prem Singh v. State of NCT of Delhi
- Lakhan Singh v. Amarjeet Singh & Anr
- Mohd. Anwar v. The State (N.C.T. of Delhi)
- Paul v. State of Kerala
- Accused 'X' v. State of Maharashtra
- Devidas Loka Rathod v. State of Maharashtra
- Mariappan v. State of Tamil Nadu
- State of Rajasthan v. Shera Ram @ Vishnu Dutta
- Elavarasan v. State Rep. by Inspector of Police
- Surendera Mishra v. State of Jharkhand
- Sudhakaran v. State of Kerala
- Jag Dish v. State of M.P.
- Siddhapal Kamala Yadav v. State of Maharashtra
- Hari Singh Gond v. State of M.P.
- Bapu@ Gajraj Singh v. State of Rajasthan
- Shrikant Anandrao Bhosale v. State of Maharashtra
- T.N. Lakshmaiah v. State of Karnataka
- State of Himachal Pradesh v. Gian Chand
- State of U.P. v. Lakhmi
- Periasami and Anr. v. State of Tamil Nadu
- M/S. Gujarat Machinery Manufacturers Ltd. v. Collector, Central Excise, Baroda.