An image forming apparatus is provided and includes: a rotating member; an engaging member to be removably engaged with the rotating member; a driving force transmitting member to be rotated and driven by a driving source; and a connecting portion that connects the engaging member to the driving force transmitting member so that the engaging member and the driving force transmitting member are movable in a misaligned direction and an axial direction. The connecting portion includes a connecting member, a pair of spherical members provided on respective ends of the connecting member, at least one of which is movable in the axial direction with respect to the engaging member and the driving force transmitting member, and a pair of fixing members that fix the pair of spherical members to the engaging member and the driving force transmitting member.