CONTACTLESS ELECTRICITY SUPPLY SYSTEM AND ELECTRICITY SUPPLY DEVICE

A power supply device 1 that supplies power from a power transmission coil 11 to a power reception coil 21 that is provided to a vehicle 2 in a non-contact manner by means of at least a magnetic coupling, comprising: a communication means that receives a startup signal for activating the power supply device 1 from a vehicle 2 that is running by wireless communication; a notification means for notifying a state of the power supply device 1; a detection means for detecting the state of the power supply device 1 based on the startup signal; and a control means for controlling the notification means based on a detection result of the detection means; wherein, the detection means detects a non-contact power supply possible state, which represents a state in which power can be supplied from the power transmission coil 11 in a non-contact manner, the control means sets a notification state of the notification means to a first notification state, when the detection means detects the non-contact power supply possible state, and sets the notification state of the notification means to a state that is different from the first notification state, when the detection means is not detecting the non-contact power supply possible state.