A hair growth modulation device is configured to impart a suitable quantity of irradiated light to a target site while lowering the irradiation intensity required by a light irradiator that generates modulating light for modulating hair growth. This device is provided with a hair follicle approximating means that causes hair follicles of body hairs at the target site to approach the skin surface, thereby enhancing the irradiation efficiency of modulating light irradiated to the hair follicles.