A rotation transmission device comprising an input shaft , an output shaft arranged coaxial with the input shaft , a two-way clutch configured to selectively transmit rotation between the input shaft and the output shaft , and an electromagnetic clutch configured to selectively engage and disengage the two-way clutch , wherein the two-way clutch (109 comprises an outer ring provided at an end of the output shaft and having an inner periphery, an inner ring provided at an end of the input shaft and having an outer periphery, a control retainer including first bars , a rotary retainer including second bars , wherein the first bars and the second bars are received between the inner periphery of the outer ring and the outer periphery of the inner ring , and arranged such that the first bars alternate with the second bars in a circumferential direction, with pockets defined between respective adjacent pairs of first and second bars , a plurality of pairs of engaging elements , each pair of the engaging elements being received in each of the pockets so as to be engageable with the inner periphery of the outer ring and the outer periphery of the inner ring , and elastic members each received in each of the pockets and biasing the pair of the engaging elements received in each of the pockets away from each other, wherein the electromagnetic clutch comprises an armature coupled to the control retainer , a rotor spaced apart from, and facing, the armature in an axial direction, and an electromagnet supported by a stationary member so as to face the rotor in the axial direction, and configured to apply a magnetic attraction force to the armature such that the armature is attracted toward the rotor , when the electromagnet is energized, wherein the rotation transmission device is configured such that when the electromagnet is energized, the control retainer is moved in the axial direction toward the rotor , together with the armature , and wherein the rotation transmission device further comprises a motion converter mechanism configured to convert the axial movement of the control retainer toward the rotor to a relative rotation between the control retainer and the rotary retainer in a direction in which circumferential widths of the pockets decrease, thereby disengaging the engaging elements , characterized in that a shock absorbing member for absorbing an impact force when the armature is attracted to the rotor is provided on one of an opposed surface of the armature facing the rotor and an opposed surface of the rotor facing the armature , and the shock absorbing member comprises a metal ring comprising an annular plate portion and a cylindrical portion provided at an outer periphery of the annular plate portion , and an elastic protrusion adhesively bonded to an inner surface of the annular plate portion of the metal ring , wherein the shock absorbing member is mounted such that the cylindrical portion is fitted on an outer periphery of one of the armature and the rotor having said one of the opposed surfaces, the annular plate portion faces an axial end surface of an annular recess formed in said one of the opposed surfaces at an outer peripheral portion of said one of the opposed surfaces, the protrusion is supported by the axial end surface , and the annular plate portion has an outer surface protruding from said one of the opposed surfaces. <EOS>