Abstract: The present invention is an assembling type of camshaft including: a cam piece having a shaft hole; and a shaft to be press-fitted into the shaft hole of the cam piece; wherein a press-fitting groove and a penetration groove are respectively formed to extend in an axial direction in an inside circumferential surface of the shaft hole of the cam piece; a press-fitting tooth is formed to extend in the axial direction partially in an outside circumferential surface of the shaft; and the press-fitting tooth is adapted to be press-fitted into the press-fitting groove in the axial direction and to pass through the penetration groove in the axial direction.