Integrally molded product and method for manufacturing integrally molded product

An integrally molded product formed by joining a structural member (a) consisting essentially of a fiber-reinforced thermosetting resin and a metal member (b), wherein the metal member (b) has an overlap region overlapping with the structural member (a), and has a joining portion in contact with the structural member (a) in at least a part of the overlap region, and in the joining portion, a ratio (αtb/αta) between a coefficient of linear expansion αta of a joining perimeter of the structural member (a) and a coefficient of linear expansion αtb of a joining perimeter of the metal member (b) in a measurement temperature range of 60° C. to 150° C. is 1.0 to 50.

A method for manufacturing an integrally molded product in which a structural member (a) consisting essentially of a fiber-reinforced thermosetting resin and a metal member (b) are joined by thermal welding via a thermoplastic resin layer, the method comprising:

• preparing the structural member (a) having a thermoplastic resin region in at least a part of a surface layer and the metal member (b) optionally having a thermoplastic resin region in at least a part of a surface;
• and bringing the structural member (a) and the metal member (b) into contact with each other in a state where the structural member (a) and/or the metal member (b) are heated, so that the structural member (a) and the metal member (b) overlap each other in a region including the thermoplastic resin region of the structural member (a).