Abstract: A compact hair brush comprises a fixing body, an elastic fixing plate, an elastic means and a cover body. The fixing body is coupled with the cover body which is freely opened and closed by a hinge. The elastic fixing plate on which a plurality of bristles is fixedly disposed is elastically fixed to the fixing body and can be protruded from the fixing body by the elastic means. The elastic fixing plate can be protruded from the fixing body by opening the cover body. When using the hairbrush, the bristles are lined up by only opening the cover body. Therefore, a user can easily use and carry the hairbrush.