A method for manufacturing an injection molded body, comprising:
- a first process of injection molding a first molded member having an accommodating portion;
- a second process of injection molding a second molded member;
- a third process in which a sealed member is mounted on the accommodating portion of the first molded member, and after this mounting, the first molded member and the second molded member are assembled to form an assembly structure body;
- and
- a fourth process in which the assembly structure body is arranged in a cavity of a molding die, and a resin bonding material is filled in a space comprising a part of the first molded member and a part of the second molded member;
- wherein the first molded member comprises, as the accommodating portion, a first accommodating portion having an elongated shape along an extending direction of the first molded member, and a second accommodating portion whose width is wider than the first accommodating portion, the first accommodating portion and the second accommodating portion are at two different sides along the extending portion, wherein, in the first molded member, a stress applied to a bonding portion of the second accommodating portion is larger than that applied to a bonding portion of the first accommodating portion, and the first molded member comprises a first wall portion in which a first abutting surface that abuts the second molded member is arranged;
- the second molded member comprises a second wall portion in which a second abutting surface that abuts the first abutting surface is arranged;
- the first wall portion is arranged on a peripheral portion of each of the first accommodating portion and the second accommodating portion, and comprises a protruding portion having a protruding surface that is continuous from the first abutting surface and protrudes outward;
- the second wall portion is arranged on the peripheral portion of each of the first accommodating portion and the second accommodating portion corresponding to the first wall portion;
- the part of the first molded member is the protruding portion, and the part of the second molded member is the second wall portion;
- and
- in the fourth process, in the second accommodating portion, the resin bonding material is filled in a manner of coming into contact with the second wall portion and the protruding surface in a state in which the first abutting surface and the second abutting surface having an uneven portion respectively are made to abut each other and the first abutting surface and the second abutting surface are in direct contact with each other at the uneven portion of the first abutting surface and the uneven portion of the second abutting surface wherein the first abutting surface and the second abutting surface are wavy with respect to each other, and the first molded member and the second molded member are bonded by the resin bonding material.