A power transmission device comprising: a clutch housing that rotates together with rotation of an input member and to which a plurality of drive-side clutch plates are attached; a clutch member to which a plurality of driven-side clutch plates that are formed alternately with the drive-side clutch plates of the clutch housing are attached and to which an output member is coupled; a pressure member that is attached to the clutch member and that is capable of pressing the drive-side clutch plates and the driven-side clutch plates against each other or releasing a press-contact force in accordance with movement thereof relative to the clutch member in an axial direction; urging means that urges the pressure member in a direction such that the drive-side clutch plates and the driven-side clutch plates are pressed against each other; a receiving member that is constituted by a separate member attached to the pressure member, that receives an urging force of the urging means on the pressure member side, and that is capable of transmitting the urging force to the pressure member; and a back-torque limiting cam that is constituted by a pair of cam surfaces that reduce a press-contact force between the drive-side clutch plates and the driven-side clutch plates if the pressure member and the clutch member rotate relative to each other when a rotation speed of the output member exceeds a rotation speed of the input member, characterized in that, one of the cam surfaces being formed in the receiving member, the other cam surface being formed in the clutch member, wherein the power transmission device is capable of transmitting or cutting off rotational power input to the input member to the output member by pressing the drive-side clutch plates and the driven-side clutch plates against each other or releasing the press-contact force, and wherein the power transmission device includes a radially-outside restricting portion that is capable of restricting radially-outward movement of the receiving member relative to the pressure member and is capable of maintaining a clearance (t) between a side surface of the receiving member and the clutch member. a clutch housing that rotates together with rotation of an input member and to which a plurality of drive-side clutch plates are attached; a clutch member to which a plurality of driven-side clutch plates that are formed alternately with the drive-side clutch plates of the clutch housing are attached and to which an output member is coupled; a pressure member that is attached to the clutch member and that is capable of pressing the drive-side clutch plates and the driven-side clutch plates against each other or releasing a press-contact force in accordance with movement thereof relative to the clutch member in an axial direction; urging means that urges the pressure member in a direction such that the drive-side clutch plates and the driven-side clutch plates are pressed against each other; a receiving member that is constituted by a separate member attached to the pressure member, that receives an urging force of the urging means on the pressure member side, and that is capable of transmitting the urging force to the pressure member; and a back-torque limiting cam that is constituted by a pair of cam surfaces that reduce a press-contact force between the drive-side clutch plates and the driven-side clutch plates if the pressure member and the clutch member rotate relative to each other when a rotation speed of the output member exceeds a rotation speed of the input member, characterized in that, one of the cam surfaces being formed in the receiving member, the other cam surface being formed in the clutch member, wherein the power transmission device is capable of transmitting or cutting off rotational power input to the input member to the output member by pressing the drive-side clutch plates and the driven-side clutch plates against each other or releasing the press-contact force, and wherein the power transmission device includes a radially-outside restricting portion that is capable of restricting radially-outward movement of the receiving member relative to the pressure member and is capable of maintaining a clearance (t) between a side surface of the receiving member and the clutch member.