Provided is an automatic power supply device which enables to perform an automatic power supply with a simple configuration, with respect to a moving body. The automatic power supply device that includes a terminal for a power supply, and supplies power to a rechargeable battery which is placed in the moving body through a power receiver which is disposed in the moving body, the automatic power supply device includes a mechanism that drives a power supplier including the power supply terminal, and a mechanism that automatically charges the moving body. The automatic power supply device includes a cavity in a portion of a housing shape of the automatic power supply device, in a measurement area of an environment recognition sensor which is included in the moving body.