An image forming apparatus capable of obtaining a good image quality without color shifts is described. The image forming apparatus includes a drive coupling 1015 which couples a drive shaft 1011 and a flange 1021 of an image bearing member 613 with a play, a taper coupling 1017 supported inside the drive coupling 1015 for holding the drive shaft 1011 and the flange 1021, and a pressing member 1013. The taper coupling 1017 includes a tip portion 1061, an axial portion 1062, a rear end portion 1063. The drive coupling 1015 includes claw portions 1042 engaging with the flange 1021 of the image bearing member 613, and a body portion 1041 having a length which is shorter than the distance between the flange 1021 of the image bearing member 613 and the rear end 1063 of the taper coupling 1017 in the axial direction of the drive shaft 1011.