Provided are a core-sheath composite fiber, and a woven fabric and fisheries tool using the same, said core-sheath composite fiber having a core part formed from a thermoplastic resin A and a sheath part formed from a thermoplastic resin B other than the thermoplastic resin A, wherein the sheath part has an anchor part that extends to the inside of the core part in a cross-section of the composite fiber, and the anchor part forms an undercut shape having a wide part wider than the root part thereof. It is possible to select materials capable of expressing optimal characteristics according to application for each of the core part and sheath part, and minimize the amount of materials used for the for the sheath part, for which comparatively expensive material is required, thereby making it possible to manufacture the composite fiber inexpensively while giving the composite fiber as a whole superior characteristics.一種芯鞘複合纖維、及使用其而成之織物與漁業材料,該芯鞘複合纖維係芯部包含熱塑性樹脂A、鞘部包含熱塑性樹脂A以外之熱塑性樹脂B的芯鞘複合纖維,其中在複合纖維的橫剖面上,鞘部具有朝芯部內延伸的錨定部,該錨定部係形成為具有寬度較其根部更廣之廣寬部的底切形狀。選定可展現芯部、鞘部各自因應用途之最佳特徵的材質,並壓低要求較昂貴之材質之鞘部的材質用量,可使複合纖維整體具有優良之特性並同時廉價地加以製造。1‧‧‧芯鞘複合纖維2‧‧‧芯部3‧‧‧鞘部4‧‧‧錨定部5‧‧‧根部6‧‧‧廣寬部Wa‧‧‧窄寬部的寬度Wb‧‧‧廣寬部的寬度
