Article 872Rescission of Contracts between the Minor Ward and the Guardian
第八百七十二条（未成年被後見人と未成年後見人等との間の契約等の取消し）
A minor ward may rescind a contract entered into with the guardian or the successor thereof after attaining the age of majority but before the accounting for the guardianship has been finalized. The same applies to a unilateral juridical act that the person performs against the guardian of a minor or the successor thereof.
未成年被後見人が成年に達した後後見の計算の終了前に、その者と未成年後見人又はその相続人との間でした契約は、その者が取り消すことができる。その者が未成年後見人又はその相続人に対してした単独行為も、同様とする。
The provisions of Article 20 and Article 121 through Article 126 apply mutatis mutandis to a case as referred to in the preceding paragraph.
第二十条及び第百二十一条から第百二十六条までの規定は、前項の場合について準用する。
Read this with the articles around it
(Effect of Revocation)
An act that has been revoked is deemed void ab initio.
取り消された行為は、初めから無効であったものとみなす。
Open this provision(Obligation of Restoration)
A person that has received payment or delivery as the performance of an obligation based on a void act has an obligation to restore the other party to the original state.
無効な行為に基づく債務の履行として給付を受けた者は、相手方を原状に復させる義務を負う。
Open this provision(Ratification of Revocable Acts)
A revocable act may not be revoked after the person prescribed in Article 120 ratifies it.
取り消すことができる行為は、第百二十条に規定する者が追認したときは、以後、取り消すことができない。
Open this provision(Method of Revocation and Ratification)
If the counterparty to an act that may be revoked is identified, the revocation or ratification of that act is made by the manifestation of intention to the counterparty.
取り消すことができる行為の相手方が確定している場合には、その取消し又は追認は、相手方に対する意思表示によってする。
Open this provision(Requirements for Ratification)
The ratification of a revocable act does not become effective unless it is made after the circumstances that made the act revocable cease to exist and the person ratifying the act becomes aware of…
取り消すことができる行為の追認は、取消しの原因となっていた状況が消滅し、かつ、取消権を有することを知った後にしなければ、その効力を生じない。
Open this provision(Statutory Ratification)
If, at or after the time when it becomes possible to ratify an act, any of the following facts occur with respect to a revocable act, it is deemed that the act has been ratified; provided, however…
追認をすることができる時以後に、取り消すことができる行為について次に掲げる事実があったときは、追認をしたものとみなす。ただし、異議をとどめたときは、この限りでない。
Open this provision(Limitation on Period of Right to Revoke)
The right to revoke an act is extinguished by the operation of the prescription if it is not exercised within five years from the time when it becomes possible to ratify the act.
取消権は、追認をすることができる時から五年間行使しないときは、時効によって消滅する。行為の時から二十年を経過したときも、同様とする。
Open this provision(Right to Demand of the Other Party to Dealings Involving a Person with Qualified Legal Capacity)
After a person with qualified legal capacity who is involved in dealings with another party becomes a person with the legal capacity to act…
制限行為能力者の相手方は、その制限行為能力者が行為能力者（行為能力の制限を受けない者をいう。以下同じ。）となった後、その者に対し、一箇月以上の期間を定めて、その期間内にその取り消すことができる行為を追認するかどうかを確答すべき旨の催告をすることができる。
Open this provision(Rescission of Contracts between the Minor Ward and the Guardian)
A minor ward may rescind a contract entered into with the guardian or the successor thereof after attaining the age of majority but before the accounting for the guardianship has been finalized.
未成年被後見人が成年に達した後後見の計算の終了前に、その者と未成年後見人又はその相続人との間でした契約は、その者が取り消すことができる。その者が未成年後見人又はその相続人に対してした単独行為も、同様とする。
Open this provisionrescission
取消し
Undoing a legal act, such as an offer or acceptance of a contract (意思表示, a manifestation of intention), that the law says may be rescinded: for example one made through an important mistake, though a mistake about the circumstances behind the act only if it had been made clear that they were its basis, and as a rule not where the person was grossly careless (Civil Code, Article 95), or one made under fraud or duress, though fraud by a third party only if the other party knew of it or could have known (Article 96), or one a minor made without the consent of their legal representative (Article 5, paragraph (2)). Once rescinded, the act is treated as void from the start (Article 121). Only the person who made it, their representative or successor, or someone whose consent it needed may rescind it (Article 120). The right is lost if not used within five years from when the act could be confirmed — once the mistake, fraud or other cause has ended and the person knows they can rescind (Article 124) — or twenty years from the act (Article 126). It is lost sooner if the person confirms the act, and once it could be confirmed, performing it or demanding performance without reserving objections counts as confirming it (Articles 122 and 125). The Consumer Contract Act adds grounds of its own, such as a business telling the consumer something untrue about an important matter when soliciting the contract, where the consumer believed it and made the contract because of it (Article 4, paragraph (1), item (i)), and gives most of them a shorter time: one year from when the act could be confirmed, and five years from the contract (Article 7, paragraph (1)).
Written by AI using Civil Code, Arts. 5, 95, 96, 120, 121, 122, 124, 125, 126 and Consumer Contract Act, Arts. 4, 7 as a reference.