A clutch structure includes a clutch input shaft, a clutch output shaft, a weight member, a one-way clutch, and a bearing. The weight member frictionally contacts a cylindrical portion of the clutch output shaft to transmit a rotational power from the clutch input shaft to the clutch output shaft and separates from the cylindrical portion to disconnect the transmission of the rotational power. When the weight member separates from the cylindrical portion and a rotational frequency of the clutch input shaft falls below a rotational frequency of the clutch output shaft, the one-way clutch links an input shaft portion of the clutch input shaft and an output shaft portion of the clutch output shaft. The one-way clutch and the bearing are located between the input shaft portion and the output shaft portion.