A reel unit for a fishing reel includes a cover member, a first member, and a second member. The cover member is made of a metal plate. The first member is made of metal. The first member is welded to an inner side of the cover member, and is configured to protrude from the cover member. The second member is made of synthetic resin. The second member is integrally formed with the cover member and the first member to at least partially cover the first member.本發明之課題係在於對釣魚用捲線器的捲線器本體,既可高度維持蓋構件的外觀,又可使內側構件不易從金屬製的蓋構件分離。用以解決課題之手段為,拇指座(8)為藉由沖壓加工所形成的鋁合金製的構件,在拇指座(8)的裏面(8a),鋁合金製的第1構件(9)以突出的方式嵌柱熔接著,在拇指座(8)及第1構件(9),藉由成形加工,一體地形成合成樹脂製的第2構件(10),用以覆蓋第1構件(9)的全部。8‧‧‧拇指座8a‧‧‧裏面9‧‧‧第1構件9a‧‧‧本體部9b‧‧‧大徑部10‧‧‧第2構件
