LAMP DEVICE

A lamp device (10) has a base body (12) to be installed to a vehicle; a lamp unit (14); a translucent cover (13) that is installed to the base body (12), covering the front surface of the base body (12) so as to accommodate the lamp unit (14) therein, thereby defining a lamp body space (11K), and has a recess (13D) in the front surface at a side position in a horizontal direction of the lamp unit (14); and a radar unit (20) that has a radar sensor (23) and a radar housing (21) accommodating the radar sensor (23) therein, and is inserted in the recess (13D).