A balancer is provided in the outer circumferential portion of a rotor of a spinning reel at the rear end of the rotor and located at the side of a bail in the fishline winding position thereof so that the center of gravity of the reel is located under a reel leg to facilitate the manipulation of the reel, and the rotative balance of the rotor is improved to stably and smoothly wind a fishline on the reel. The axis of the pivotally coupled portion of a bail support member, which is pivotally coupled to a bail support arm, is off set from the axis of the rotor toward the side of the bail in the fishline unwinding position to reduce the weight of the balancer.