To provide a light device capable of efficiently carrying out positional information management.

A light device comprises: a light source that irradiates light to the outside; positional information transmission means that transmits positional information of the light device to a wireless terminal; terminal information reception means that receives identification information of the wireless terminal and the positional information from the wireless terminal that has received the positional information; terminal information transmission means that transmits the identification information and the positional information to a management server that manages a position of the wireless terminal; and voltage conversion means that converts a voltage of power supplied from an external power source and supplies the power to the positional information transmission means, the terminal information reception means and the terminal information transmission means.