A crank is provided with a crank axle connecting portion for connecting a crank axle thereto, a pedal connecting portion for connecting a pedal thereto, and a main crank portion positioned between the crank axle connecting portion and the pedal connecting portion. A first insert member is arranged in the crank axle connecting portion, and has an axle attaching part having a crank axle connecting hole and an extended part extending from the axle attaching part toward the pedal connecting portion so as to following along the main crank portion. The crank axle further includes a shell member made of a fiber-reinforced resin that at least partially covers an outside facing surface of the first insert member.