If a condition has already been fulfilled at the time of a juridical act and that condition is a condition precedent, the juridical act constitutes an unconditional act; if that condition is a condition subsequent, the juridical act is void.
条件が法律行為の時に既に成就していた場合において、その条件が停止条件であるときはその法律行為は無条件とし、その条件が解除条件であるときはその法律行為は無効とする。
If it has already been established at the time of a juridical act that a condition will not be fulfilled and that condition is a condition precedent, the juridical act is void; if that condition is a condition subsequent, the juridical act constitutes an unconditional act.
条件が成就しないことが法律行為の時に既に確定していた場合において、その条件が停止条件であるときはその法律行為は無効とし、その条件が解除条件であるときはその法律行為は無条件とする。
In the cases referred to in the provisions of the preceding two paragraphs, the provisions of Article 128 and Article 129 apply mutatis mutandis until the relevant party becomes aware that the condition has been or has not been fulfilled.