A spinning reel includes a handle, a reel unit, a rotor, a spool, a spool shaft, and an oscillating mechanism. The oscillating mechanism includes a traverse cam and a slider including a slider body, a through hole, an engaging member, a first bearing, and a retainer member. The slider body is coupled to the spool shaft. The engaging member has a shaft part and an engaging part. The engaging part is mounted to a tip end of the shaft part to be engaged with helical grooves. The first bearing has a fitted part, a protruding part, and a support hole. The fitted part is fitted into the through hole. The protruding part has a diameter smaller than a diameter of the fitted part. The fitted part includes a stepped surface on an end thereof abutting the protruding part. The retainer member retains the first bearing at the stepped surface.