A pinion gear meshes with a drive gear. The drive gear is connected to a handle shaft of a fishing reel that winds a fishing line onto a spool supported by a reel body by rotational operation of the handle shaft rotatably supported to the reel body to transmit the rotation of the handle shaft. The pinion gear includes a gear portion and a shaft. The gear portion meshes with the drive gear. The shaft portion, to which the gear portion is non-rotatably fitted, is integrally rotatable with the gear portion. The gear portion and the shaft portion are formed from different materials, and the specific gravity of the shaft portion is smaller than the specific gravity of the gear portion.本發明之課題在於減輕與釣魚用捲線器之驅動齒輪嚙合之小齒輪。 本發明之小齒輪3與結合於釣魚用捲線器之手柄軸之驅動齒輪嚙合，而傳遞手柄軸之旋轉，該釣魚用捲線器係藉由可旋轉地支持於捲線器本體之手柄軸之旋轉操作，而將釣線捲繞於由捲線器本體支持之捲線筒。小齒輪3由齒輪31及軸32構成。齒輪31嚙合於驅動齒輪。軸32供齒輪31止轉嵌合，而與齒輪31一體旋轉。齒輪31與軸32為不同材質，且軸32之比重小於齒輪31之比重。
