An action seeking an enforcement judgment for a foreign court judgment is subject to the jurisdiction of the district court (or the family court, for an action concerning a judicial decision in a domestic relations case; the same applies in this paragraph) having jurisdiction in the locality constituting the general venue of the obligor, and if there is no general venue, it is subject to the jurisdiction of the district court having jurisdiction in the place where the subject matter of the claim or the seizable property of the obligor is located.
外国裁判所の判決についての執行判決を求める訴えは、債務者の普通裁判籍の所在地を管轄する地方裁判所（家事事件における裁判に係るものにあつては、家庭裁判所。以下この項において同じ。）が管轄し、この普通裁判籍がないときは、請求の目的又は差し押さえることができる債務者の財産の所在地を管轄する地方裁判所が管轄する。
Notwithstanding the provisions of the preceding paragraph, even if all or part of an action as referred to in that paragraph is subject to the jurisdiction of the family court, the district court provided for in the preceding paragraph, upon petition or by its own authority, may conduct the trial and reach a judicial decision itself for all or part of the litigation in the action, if it finds this to be appropriate.
Notwithstanding the provisions of paragraph (1), even if all or part of an action as referred to in that paragraph is subject to the jurisdiction of the district court, the family court provided for in that paragraph, upon petition or by its own authority, may conduct the trial and reach a judicial decision itself for all or part of the litigation in the action, if it finds this to be appropriate.
The court must make an enforcement judgment without investigating the correctness or incorrectness of the judicial decision.
執行判決は、裁判の当否を調査しないでしなければならない。
The action referred to in paragraph (1) must be denied if it is not proved that the judgment of a foreign court has become final and binding or when the judgment fails to satisfy the requirements stated in the items of Article 118 of the Code of Civil Procedure (including as applied mutatis mutandis pursuant to Article 79-2 of the Domestic Relations Case Procedure Act (Act No. 52 of 2011)).
第一項の訴えは、外国裁判所の判決が、確定したことが証明されないとき、又は民事訴訟法第百十八条各号（家事事件手続法（平成二十三年法律第五十二号）第七十九条の二において準用する場合を含む。）に掲げる要件を具備しないときは、却下しなければならない。
In an enforcement judgment, a declaration must be made permitting judicial enforcement based on the foreign court judgment.
執行判決においては、外国裁判所の判決による強制執行を許す旨を宣言しなければならない。
Read this with the articles around it