A treatment device for a scalp including a body that defines an exterior design and has one surface in which a plurality of light irradiation holes are formed, a light generation unit provided in the body and a beam splitter that dividedly refractionates light generated in the light generation unit into a plurality of lights and guides the lights toward the plurality of the light irradiation holes and a travel direction of the light generated in the light generation unit is different from a travel direction of the light passing the beam splitter.