Provided is an ultraviolet light radiating device that can be operated after a short time even if placed in an environment in which stop time continues over an extended period of time. The ultraviolet light radiating device includes: an excimer lamp that emits ultraviolet light; a lighting circuit that applies a lighting voltage to the excimer lamp; and a controller that performs energization control for the lighting circuit. The controller performs control to energize the lighting circuit for a first predetermined time at a predetermined timing.