Its wordings
Arbitration Act
Article 18, paragraph (4)
第十八条第四項
Each amendment that changed this provision, and each that will, oldest first. Each is shown against the wording just before it; where an amendment gives the provision another number, it is followed under the new one. Read it as it stands today
In force today
An arbitrator must disclose all the facts that would be likely to give rise to doubts as to their impartiality or independence (excluding those which have already been disclosed) to the parties without delay during the course of the arbitration procedure.
仲裁人は、仲裁手続の進行中、当事者に対し、自己の公正性又は独立性に疑いを生じさせるおそれのある事実（既に開示したものを除く。）の全部を遅滞なく開示しなければならない。