[PROBLEMS] To eliminate the wiring of electrical products in the aquarium, and has the advantage of being completely waterproofed and easy to assemble without exposing the conductive contacts, and improving the appearance of the aquarium. A power supply device is provided. A wireless power feeding device of a water tank includes a power supply device, a first housing, a wireless power supply unit, a second housing, a wireless power receiving unit, and a load device. The first housing 20 has at least one first fixing member provided outward on one side, and is disposed outside the water tank 200 via the first fixing member. The wireless power supply unit is provided in the first housing 20 and includes a first induction coil that converts electrical energy into an electromagnetic field. The first induction coil is electrically connected to the power supply device 10. The second housing 40 has at least one second fixing member provided outward on one side. [Selection] Figure 2【課題】水槽内の電気製品の配線を省略することができる上、防水を完全に行い、導電接点が露出されずに組立が容易な長所を有し、水槽の見た目を向上する、水槽の無線給電装置を提供する。【解決手段】水槽２００の無線給電装置１００は、電源装置１０、第１のハウジング２０、無線電力供給ユニット、第２のハウジング４０、無線受電ユニット及び負荷装置６０を備える。第１のハウジング２０は、外方へ設けられた少なくとも１つの第１の固定部材を一側に有し、第１の固定部材を介して水槽２００の外側に配設される。無線電力供給ユニットは、第１のハウジング２０に設けられるとともに、電気エネルギを電磁場へ変換する第１の誘導コイルを含む。第１の誘導コイルは、電源装置１０と電気的に接続される。第２のハウジング４０は、外方へ設けられる少なくとも１つの第２の固定部材を一側に有する。【選択図】図２
