PROBLEM TO BE SOLVED: To provide a resin arm for forceps having high strength and low deformation by using the same resin as a conventional resin arm and using the same amount. SOLUTION: The resin arm for forceps of the present invention has a first arm 1 and a second arm 2 which can be opened and closed and swung around a pivot 4, and the first and second arms are made of synthetic resin. Each arm is provided with fitting portions 14 and 24 in the central portion, grip portions 11 and 21 are provided at the tip portions of the front side handle portions 1a and 2a from the fitting portion, and the handle portions 1b and 2b rearward from the fitting portion. The tail is provided with grips 13 and 23, respectively, and the opposite sides of the grip are provided with a ratchet mechanism 9 that operates in the closing direction of the first and second arms, and at least one of the front handle and the rear handle. The cross-sectional shape 8 orthogonal to the longitudinal direction of the above is a pentagonal to octagonal polygon 5 or a rhombus 7. [Selection diagram] Fig. 1【課題】 従来樹脂製アームと同じ樹脂を、同じ量を用いて、しかも高強度・低変形の鉗子用樹脂製アームを提供することにある。【解決手段】 本発明の鉗子用樹脂製アームは、枢軸４を中心にして開閉揺動自在となる第一アーム１と第二アーム２において、第一・第二アームは合成樹脂製であり、各アームは中心部に嵌合部１４，２４を備え、該嵌合部より前方側柄部１ａ，２ａの先部に把持部１１，２１を、嵌合部より後方側柄部１ｂ，２ｂの尾部に握り部１３，２３を各々備え、握り部の相対向側に、第一・第二アームの閉じ方向側に作動するラチェット機構９を備え、前方側柄部と後方側柄部の少なくとも一方の長手方向に直交する断面形状８が五角形～八角形の多角形５又は菱形７であることを特徴とする。【選択図】 図１
