A rotor 120 for a spinning reel 100 for fishing, includes a cylindrical portion 121, a first rotor arm 210, a second rotor arm 220 and a reinforcement portion 127. The cylindrical portion 121 has a rear end opening 126 that is open. The first rotor arm 210 extends forward from an outer peripheral portion of the cylindrical portion 121 and configured to couple to a first bail support portion 21 including a line roller 3. The second rotor arm 220 is at a position opposing the first rotor arm 210, extending forward from the outer peripheral portion of the cylindrical portion 121, and configured to couple to a second bail support portion 22 holding an end of a bail 23 that extends from the first bail support portion 21. The reinforcement portion 127 has a wall portion that is thicker than a surrounding portion, and is disposed on an inner peripheral portion of the cylindrical portion 121 in a position at which the first rotor arm 210 is disposed.本發明之課題係提供一種提高了現有構造構件之強度、輕量且旋轉平衡良好之釣具用捲線器之轉子。 本發明之釣具用捲線器之轉子120具備:圓筒部121,其後端部126開口;第1轉子臂210,其自圓筒部121之外周向前方延伸,且與具有線輥之第1導線環支持部結合;第2轉子臂220,其設置於與第1轉子臂210對向之位置,且自圓筒部121之外周向前方延伸,並與保持自第1導線環支持部延伸之導線環之另一端之第2導線環支持部結合;及第1補強部127,其設置於設有第1轉子臂210之位置之圓筒部121之內周,且壁厚較周圍厚。22c‧‧‧支持軸24‧‧‧支持軸120‧‧‧轉子121‧‧‧轉子本體部(圓筒部)121a‧‧‧前端部122‧‧‧圓盤部124‧‧‧凸座部125‧‧‧貫通孔126‧‧‧後端部(開口端)127‧‧‧厚壁部(第1補強部)210‧‧‧第1轉子臂220‧‧‧第2轉子臂A-A‧‧‧剖面B-B‧‧‧剖面C-C‧‧‧剖面n‧‧‧長度S‧‧‧圓筒軸
