JapanWhat is representation? To what extent?
Representation in Japan is the legal authority for one person to act on behalf of another in civil matters, as defined and limited by the Civil Code. Its scope depends on the type (statutory or voluntary) and must comply with statutory formalities and limits.
What the Law Says
Japanese civil law defines representation as a mechanism allowing a representative to perform legal acts on behalf of another person (the principal), with effects directly binding the principal. The Civil Code strictly regulates when and how representation may occur.
Representation is divided into two main types: statutory representation (e.g., parents representing minor children) and voluntary representation (e.g., through a power of attorney). Statutory representation arises automatically by operation of law, while voluntary representation requires a valid grant of authority.
The scope of representation is not unlimited. A representative may only perform acts that the principal could legally do themselves — and only within the authority expressly or impliedly conferred. Acts beyond this scope are generally ineffective against the principal unless ratified.
Certain acts are expressly prohibited from being performed by representation under Japanese law, including making a will, entering into marriage, or accepting or renouncing inheritance — because these involve highly personal rights and intentions.
Statutory TextA person may, by virtue of a provision of laws and regulations or of an act of a third party, effect a juristic act in the name of another person.
— Civil Code, s. 99 — Definition of Representation
Statutory TextThe effect of a juristic act effected by a representative within the scope of his/her authority shall be directly attributable to the principal.
— Civil Code, s. 100 — Effect of Representation
Statutory TextA representative may not, without special authorization, effect a juristic act which involves the acquisition or disposition of real property or other acts specified by Cabinet Order.
— Civil Code, s. 102 — Prohibition of Certain Acts by Representative
Statutory TextA juristic act effected by a person without authority to represent another shall not be effective against the principal unless ratified by the principal.
— Civil Code, s. 103 — Unauthorized Representation
What to Do
Confirm whether representation is statutory (e.g., parental authority over a minor) or voluntary (requires written power of attorney for significant acts).
Ensure any voluntary representation complies with formal requirements — e.g., notarized document for real estate transactions.
Verify the representative’s authority covers the specific act intended; otherwise, obtain express authorization or ratification.
Avoid using representation for prohibited personal acts like making a will or marrying — these require direct personal action.
Sources
Not legal advice. This article is general information based on publicly available sources, written for educational purposes. Laws change and individual situations vary. Consult a licensed attorney in your jurisdiction before acting on anything you read here. Last reviewed: 2026-06-09.