A centrifugal clutch, comprising: a drive plate that receives driving force of an engine and is rotationally driven integrally with a driven pulley; a clutch outer part that includes a tubular surface provided to be concentric to the drive plate outside the drive plate; a plurality of clutch weights that include a clutch shoe that is formed to extend along a circumferential direction of the drive plate and faces the tubular surface of the clutch outer part, one end part side in the circumferential direction that is rotatably attached on the drive plate via an oscillation support pin and a long hole-shaped pin slide hole, and the other end part side that is displaced toward a side of the tubular surface of the clutch outer part, wherein the oscillation support pin is rotatably and slidably fitted in the pin slide hole; a side plate that is adjacently disposed on an opposite side of the drive plate with respect to the plurality of clutch weights for holding the clutch weights; a projection body that is provided on the drive plate or the side plate to protrude toward the clutch weight; a driven part that is provided on the clutch weight and runs on the projection body when displaced to the other end part side of the clutch weight, wherein the clutch shoe is pushed to the tubular surface by the driven part running on the projection body; and a clutch spring that is attached to the clutch weight and acts on force in a direction that separates the other end part side of the clutch weight from the clutch outer part, wherein the projection body and the driven part are formed in a manner that a projection body range between one end part and the other end part in a thickness direction of the clutch weight at a portion where the projection body and the driven part come into contact with each other overlaps an action position (FP1, FP2) in the thickness direction of the clutch weight where force (F1, F2) of the clutch spring acts on, wherein a dimension of the pin slide hole in a longitudinal direction thereof is larger than a dimension of the pin slide hole in a width direction thereof, wherein the width direction of the pin slide hole corresponds to the radial direction of the drive plate and the longitudinal direction of the pin slide hole extends in an arc shape or a straight line in a direction that allows displacement of the clutch weight in the circumferential direction of the drive plate within the range of the long hole. a drive plate that receives driving force of an engine and is rotationally driven integrally with a driven pulley; a clutch outer part that includes a tubular surface provided to be concentric to the drive plate outside the drive plate; a plurality of clutch weights that include a clutch shoe that is formed to extend along a circumferential direction of the drive plate and faces the tubular surface of the clutch outer part, one end part side in the circumferential direction that is rotatably attached on the drive plate via an oscillation support pin and a long hole-shaped pin slide hole, and the other end part side that is displaced toward a side of the tubular surface of the clutch outer part, wherein the oscillation support pin is rotatably and slidably fitted in the pin slide hole; a side plate that is adjacently disposed on an opposite side of the drive plate with respect to the plurality of clutch weights for holding the clutch weights; a projection body that is provided on the drive plate or the side plate to protrude toward the clutch weight; a driven part that is provided on the clutch weight and runs on the projection body when displaced to the other end part side of the clutch weight, wherein the clutch shoe is pushed to the tubular surface by the driven part running on the projection body; and a clutch spring that is attached to the clutch weight and acts on force in a direction that separates the other end part side of the clutch weight from the clutch outer part, wherein the projection body and the driven part are formed in a manner that a projection body range between one end part and the other end part in a thickness direction of the clutch weight at a portion where the projection body and the driven part come into contact with each other overlaps an action position (FP1, FP2) in the thickness direction of the clutch weight where force (F1, F2) of the clutch spring acts on, wherein a dimension of the pin slide hole in a longitudinal direction thereof is larger than a dimension of the pin slide hole in a width direction thereof, wherein the width direction of the pin slide hole corresponds to the radial direction of the drive plate and the longitudinal direction of the pin slide hole extends in an arc shape or a straight line in a direction that allows displacement of the clutch weight in the circumferential direction of the drive plate within the range of the long hole.