A clutch structure includes a rotary shaft, a cylinder, and a clutch. An outer peripheral fitting surface of the rotary shaft includes an engagement groove. The engagement groove extends in an axial direction along a rotation axis of the rotary shaft. A clutch cover of the clutch includes an engagement protrusion. The engagement protrusion protrudes inwardly in a radial direction with respect to the rotation axis from an inner peripheral surface of an annular inner edge of the clutch cover. The engagement protrusion engages in the engagement groove to hinder the clutch cover from rotating about the rotation axis relative to the rotary shaft.