As the facility is aging 30 years after its opening, aquariums have begun to consider the construction of a new facility and the ideal aquarium. aquariums soliciting opinions from the citizens of Tokyo at the end of 2018. In January 2019, aquariums formulated the basic concept of building a new facility on the premises. Then, in February 2020, a study group of experts approved the rebuilding plan report. The scale is expected to have a total floor area of about 22,500 square meters and maintenance costs of 24 to 27 billion yen.「老朽化進む葛西臨海水族園 代替施設を建設へ」「敷地内、来年1月めどに事業計画」『朝日新聞』2019年2月4日、P23東京。 A business plan will be formulated by the end of 2020, and it is expected to open in 2026.「葛西臨海水族館 建て替え - 都検討会 26年度再オープン」読売新聞 2020年2月6日、地域 都民14版27頁。
