WIRELESS POWER FEEDING SYSTEM HAVING BATTERY MOUNTED DEVICE ENGAGED WITH POWER RECEIVING DEVICE WITH LIGHT UNIT MOUNTED DEVICE

A light unit is replaced in the water, and power is supplied without an electrical contact. A composite wireless power feeding system includes a first wireless power feeding system including a first power feeding coil, a first power feeding circuit unit, a first power reception coil, a first power reception circuit unit, and a first battery, and a second wireless power feeding system including a second power feeding coil, a second power feeding circuit unit, a second power reception coil, a second power reception circuit unit, and an energy consumption circuit unit. The first power reception coil is also used as the second power feeding coil. The first battery is a power source that causes the second power feeding coil to generate electromagnetic waves. The second power feeding circuit unit and the first power reception circuit unit are mounted on one circuit board, such that switching between a power feeding mode and a power reception mode can be performed by predetermined mode switching means. Energy is supplied to the energy consumption circuit unit in a case where the power feeding mode is activated by the mode switching means, and the first battery is charged in a case where the power reception mode is activated by the mode switching means. Engagement is made without an electrical contact.