Its wordings
Arbitration Act
Article 19, paragraph (1)
第十九条第一項
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
The procedure for challenging an arbitrator is as provided by the agreement of the parties; provided, however, that this does not apply to what is provided for in paragraph (4).
仲裁人の忌避の手続は、当事者が合意により定めるところによる。ただし、第四項に規定するものについては、この限りでない。