The purpose of the present invention is to provide a hair restoration/growth stimulating device that stably provides sufficient hair restoration/growth stimulating effects without using ultra-narrow band light. Provided is a hair restoration/growth stimulating device 1 provided with a casing 2 to be worn on the head of a user and a plurality of light emitting diodes 3 that are attached inside the casing 2 and emit light having a peak wavelength band of 630-660 nm and a full width at half maximum of 15-20 nm. The hair restoration/growth stimulating device is configured to directly irradiate the user's head with light emitted from the light emitting diodes 3.
