A treatment device of the present invention includes: a housing in which an electric component such as a rechargeable battery is incorporated first and second brush units each having a plurality of brushes and formed of a translucent material an LED lamp incorporated in a base end part of the plural brushes in the housing waterproofing O-ring and packing which seal an accommodating portion for the electric component in the housing against the outside and a brush drive mechanism which reciprocates the first and second brush units in a direction along a surface of a scalp in a manner that approach or separation between tip parts of the plural brushes tip portions of the which are contacted with the scalp is repeated.
