Abstract: A sandwiched-molded part for a transmission apparatus has a slide rail body and a rail support body. A chain runs in slidable contact with the slide rail body. The molded part has a first resin forming a surface layer. The first resin has NYLON (66) as a main component. The melt viscosity of the first resin at a temperature of 300° C. is 500 Pa·s to 2000 Pa·s at a shear rate of 1000 s?1. A second resin forms a core layer of the molded part and has a bending strength higher than that of the first resin. The wall thickness of the surface layer of the sliding part of the slide rail body is 1.0 mm or more.

Abstract: A sandwich-molded part for a transmission device comprising a slide rail 11 on which a chain slides and a rail support 12, wherein a first resin forming a surface layer is formed of a material having nylon 66 as the principal component, and the melt viscosity of the first resin at 300° C. is 500 Pa·s or more and 2000 Pa·s or less at a shear rate of 1000s-1; a second resin forming a core layer has a bending strength higher than that of the first resin; and the surface layer on a sliding part 11a of the slide rail 11 has a thickness of 1.0 mm or more. Thus, the sandwich-molded part for a transmission device capable of effectively preventing endurance from lowering in practical use can be provided.