A rotor for a spinning reel for fishing, includes a cylindrical portion, a first rotor arm, a second rotor arm and a reinforcement portion. The cylindrical portion has a rear end opening that is open. The first rotor arm extends forward from an outer peripheral portion of the cylindrical portion and configured to couple to a first bail support portion including a line roller. The second rotor arm is at a position opposing the first rotor arm, extending forward from the outer peripheral portion of the cylindrical portion, and configured to couple to a second bail support portion holding an end of a bail that extends from the first bail support portion. The reinforcement portion has a wall portion that is thicker than a surrounding portion, and is disposed on an inner peripheral portion of the cylindrical portion in a position at which the first rotor arm is disposed.
