Light can be radiated onto a desired region of skin in a reliable and simple manner while preventing the radiation of light onto regions other than the desired region. A light radiator is provided with: a light source that radiates light onto skin； a light shielding member that is arranged between the skin and the light source； and a flexible base on which the light source and the light shielding member are mounted, in which an opening that corresponds to a specific region of the skin can be formed in the light shielding member, and the light is radiated onto the specific region through the opening.
