The present invention relates to a brush head assembly for an electric toothbrush, the brush bristles are implanted head Doedoe elongated from the bristle head, the bristle head portion adjacent the head, the protruding shaft while the opposite end is formed with a guide protrusion protruding engaging portion in the radial direction along the outer circumferential surface Said head shaft is inserted, the front end has a first inner diameter of the coupling groove engaging the protruding engaging portion fit is formed, and the rear end inner diameter of the second coupling shaft guide grooves are formed The inner diameter of the tip end and working the spiral guide groove is formed in the guide protrusion is inserted a predetermined length, the rear end has a drive shaft that operates in a straight line fashion from retracting an electric toothbrush body, and the elastic section is assembled to be saptal groove is formed, the guide shaft embedded operating member The distal end portion outer peripheral surface is formed to be fixed obstacle group engaging in the second engagement groove, which rear end portion has a screw hole assembly secured to an electric toothbrush body is formed, the connection member for fixing the guide shaft detachably to the electric toothbrush body including the furnishing of electric toothbrush brush head assembly wherein the configuration. According to the invention, the linear reciprocating power transmission to the power transmission shaft that receives motion combined with the guide shaft is moved forward and backward by a certain spiral brush head in the form as the shuttle times in the angular range by being rotated character by repeatedly turning the brush head in the vertical direction brushing effect The excellent and easy-to-use, and replace, the structure is also easy to get the effect of reducing manufacturing costs.본 발명은 전동칫솔용 칫솔모 헤드 조립체에 관한 것으로, 칫솔모가 식모된 칫솔모 헤드 상기 칫솔모 헤드로부터 길게 연장되되, 칫솔모 헤드 인접부위에는 외주면을 따라 돌출형 결합부가 형성되는 한편 반대측