法令翻訳 http://www.japaneselawtranslat...amp;page=4

(日本における代表者の選任の登記等)
第九百三十四条   日本に営業所を設けていない外国会社が外国会社の登記後に日本における代表者を新たに定めた場合（その住所地が登記がされた他の日本における代表者の住所地を管轄する登記所の管轄区域内にある場合を除く。）には、三週間以内に、その新たに定めた日本における代表者の住所地においても、外国会社の登記をしなければならない。

Registration of Appointment of a Representative in Japan
Article 934   In cases where a Foreign Company that has not established a business office in Japan specifies a new representative in Japan after registration of the Foreign Company (excluding cases where the address of the relevant representative is within the jurisdictional district of the registry having jurisdiction over the address of another representative in Japan), the registration of the Foreign Company must also be completed at the address of such newly specified representative in Japan, within three weeks.

日本に営業所を設けた外国会社が外国会社の登記後に日本に営業所を新たに設けた場合（その所在地が登記がされた他の営業所の所在地を管轄する登記所の管轄区域内にある場合を除く。）には、三週間以内に、その新たに設けた日本における営業所の所在地においても、外国会社の登記をしなければならない。

In cases where a Foreign Company that has established a business office(s) in Japan establishes a new business office in Japan after registration of the Foreign Company (excluding cases where the location of the relevant business office is within the jurisdictional district of the registry office having jurisdiction over the location of another registered business office), the registration of the Foreign Company must also be completed at the location of such newly established business office in Japan, within three weeks.