トピ主です。
外務省(Ministry of Foreign Affairs of Japan)のサイト(Web)に下記のように記載がありますが、やはり私の認識ではバークに加盟していると思っています。私の英語の問題でしょうか?
https://www.mofa.go.jp/fp/hr_ha/page22e_000250.html
Conclusion of the Convention
In Japan, the Government set up the meeting of Parliamentary Senior Vice-Ministers of concerned government agencies in January 2011 to discuss whether it should conclude the Hague Convention and deliberate issues such as how to ensure consistency with the domestic legal system and how to ensure safe return of a child, and how a Central Authority should be established, taking into account various views for and against the conclusion of the Convention. As a result, the Government came to a conclusion that concluding the Hague Convention would have much significance. In May 2011 the Cabinet approved to start preparation for the conclusion of the Convention. Under the policy to establish a "Central Authority" within the Ministry of Foreign Affairs as the focal point to facilitate application for the return of the child and other procedures, implementing legislation was drafted by the Ministry of Justice and the Ministry of Foreign Affairs along with those with specialist knowledge.
At the 183rd Ordinary Session of the Diet on May 22, 2013, the conclusion of Convention on the Civil Aspects of International Child Abduction(the Hague Convention)was approved, and on June 12 the Act for Implementation of Convention on the Civil Aspects of International Child Abduction (the Implementation Act) was enacted.
In response to the approval and enactment of the Convention and the Implementation Act, the Cabinet made approval on signature, conclusion and promulgation of the Convention, and the Government of Japan signed the Convention and submitted the instrument of acceptance to the Ministry of Foreign Affairs of the Netherlands on January 24, 2014. Consequently, the Hague Convention came into effect from April 1st of 2014 in Japan.