A centrifugal clutch comprising: a drive plate to be rotatably driven together with a driven pulley in response to drive force of an engine; a clutch outer having, outside the drive plate, a cylindrical surface provided concentrically with the drive plate; a clutch weight having a clutch shoe formed to extend along a circumferential direction of the drive plate and facing the cylindrical surface of the clutch outer, one end side of the clutch weight in the circumferential direction being turnably attached onto the drive through a swing support pin and a pin slide hole and the other end side displacing toward a cylindrical surface side of the clutch outer; a plate-side cam body having, on the drive plate, a sliding surface extending in a rotary drive axis direction of the drive plate; and a weight-side cam body having a sliding surface provided at the clutch weight and configured to slide and climb on the plate-side cam body upon displacement of the other end side of the clutch weight, wherein the swing support pin is provided at one of the drive plate or the clutch weight and is formed to extend toward the other one of the drive plate or the clutch weight, the pin slide hole is provided at the other one of the drive plate or the clutch weight and is formed in a long hole shape allowing backward displacement of the one end side of the clutch weight in the rotary drive direction of the drive plate, and the swing support pin is slidably displaceably fitted in the pin slide hole, and at the plate-side cam body and the weight-side cam body at least one of the sliding surfaces has a curved surface, characterized in that the at least one of the sliding surfaces is, assuming a cam angle (α) as an angle between a normal line to a line passing through a sliding portion at which the plate-side cam body and the weight-side cam body contact each other and a rotary drive center of the drive plate and a tangential line to the curved surface at the sliding portion, formed as such a curved surface that the cam angle (α) when the clutch shoe contacts the cylindrical surface of the clutch outer is identical between before and after abrasion of the clutch shoe progresses or the cam angle (α) after the abrasion has progressed is greater. a drive plate to be rotatably driven together with a driven pulley in response to drive force of an engine; a clutch outer having, outside the drive plate, a cylindrical surface provided concentrically with the drive plate; a clutch weight having a clutch shoe formed to extend along a circumferential direction of the drive plate and facing the cylindrical surface of the clutch outer, one end side of the clutch weight in the circumferential direction being turnably attached onto the drive through a swing support pin and a pin slide hole and the other end side displacing toward a cylindrical surface side of the clutch outer; a plate-side cam body having, on the drive plate, a sliding surface extending in a rotary drive axis direction of the drive plate; and a weight-side cam body having a sliding surface provided at the clutch weight and configured to slide and climb on the plate-side cam body upon displacement of the other end side of the clutch weight, wherein the swing support pin is provided at one of the drive plate or the clutch weight and is formed to extend toward the other one of the drive plate or the clutch weight, the pin slide hole is provided at the other one of the drive plate or the clutch weight and is formed in a long hole shape allowing backward displacement of the one end side of the clutch weight in the rotary drive direction of the drive plate, and the swing support pin is slidably displaceably fitted in the pin slide hole, and at the plate-side cam body and the weight-side cam body at least one of the sliding surfaces has a curved surface, characterized in that the at least one of the sliding surfaces is, assuming a cam angle (α) as an angle between a normal line to a line passing through a sliding portion at which the plate-side cam body and the weight-side cam body contact each other and a rotary drive center of the drive plate and a tangential line to the curved surface at the sliding portion, formed as such a curved surface that the cam angle (α) when the clutch shoe contacts the cylindrical surface of the clutch outer is identical between before and after abrasion of the clutch shoe progresses or the cam angle (α) after the abrasion has progressed is greater. at least one of the sliding surfaces has a curved surface, characterized in that the at least one of the sliding surfaces is, assuming a cam angle (α) as an angle between a normal line to a line passing through a sliding portion at which the plate-side cam body and the weight-side cam body contact each other and a rotary drive center of the drive plate and a tangential line to the curved surface at the sliding portion, formed as such a curved surface that the cam angle (α) when the clutch shoe contacts the cylindrical surface of the clutch outer is identical between before and after abrasion of the clutch shoe progresses or the cam angle (α) after the abrasion has progressed is greater.