A clutch includes a clutch housing, a drive-side rotation body, a driven-side rotation body, a rolling element arranged between an inner circumferential surface of the clutch housing and the driven-side rotation body, a support member, and grease. The support member holds the rolling element between the inner circumferential surface of the clutch housing and the driven-side rotation body. The grease is located between the inner circumferential surface of the clutch housing and the rolling element. The support member includes a guide arranged on a distal surface of the support member. When the grease is unevenly applied to the inner circumferential surface of the clutch housing, the guide is configured to guide the grease to be evenly applied to the inner circumferential surface of the clutch housing when inserted into the clutch housing.