UNDERWATER POWER SUPPLY SYSTEM

An underwater power supply system is provided with an ascending/descending station (20) that ascends and descends underwater between the water depth at which an underwater moving body (10) works and the vicinity of the water surface (2), and a charging station (30) that supplies electrical power wirelessly to the ascending/descending station (20) in the vicinity of the water surface (2). At the aforementioned water depth, the underwater moving body (10) moves adjacent to the ascending/descending station (20), and electrical power is supplied wirelessly from the ascending/descending station (20) to the underwater moving body (10).