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 positioned outside the drive plate in a radial direction and having 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 a cylindrical surface of the clutch outer , the clutch weight being driven to rotate with a rotary drive force of the drive plate ; a protrusion provided to protrude toward the clutch weight on the drive plate ; and a driven portion provided at the clutch weight , wherein one end side of the clutch weight in the circumferential direction is rotatably attached onto the drive plate via a swing support pin and a pin slide hole , the other end side of the clutch weight in the circumferential direction is displaced toward a cylindrical surface side of the clutch outer , the driven portion of the clutch weight climbs on the protrusion upon displacement of the other end side of the clutch weight , 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 , characterized in that the pin slide hole is formed in a long hole shape allowing the one end side of the clutch weight to displace backward in a rotary drive direction of the drive plate , and the swing support pin is slidably fitted in the pin slide hole . a drive plate to be rotatably driven together with a driven pulley in response to drive force of an engine; a clutch outer positioned outside the drive plate in a radial direction and having 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 a cylindrical surface of the clutch outer , the clutch weight being driven to rotate with a rotary drive force of the drive plate ; a protrusion provided to protrude toward the clutch weight on the drive plate ; and a driven portion provided at the clutch weight , wherein one end side of the clutch weight in the circumferential direction is rotatably attached onto the drive plate via a swing support pin and a pin slide hole , the other end side of the clutch weight in the circumferential direction is displaced toward a cylindrical surface side of the clutch outer , the driven portion of the clutch weight climbs on the protrusion upon displacement of the other end side of the clutch weight , 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 , characterized in that the pin slide hole is formed in a long hole shape allowing the one end side of the clutch weight to displace backward in a rotary drive direction of the drive plate , and the swing support pin is slidably fitted in the pin slide hole . <EOS>