Joining structure, joining method, exterior body for wire harness, and wire harness

Abstract

Provided are a joining structure, a joining method, an exterior body for a wire harness, and a wire harness capable of firmly joining members having different physical properties while reducing the thickness of a joint part. The joining structurejoins a first membermade of a first resin and a second membermade of a second resin, wherein: the second resin has physical properties having a higher foaming ratio than the first resin; and a recessed joint partis provided which reaches at least the inside of the first memberfrom the outer surface side of the second member in a state in which the first memberand the second memberare superimposed. Furthermore, a method for manufacturing the joining structurecomprises the steps of: superimposing a first membermade of a first resin and a second membermade of a second resin having physical properties having a higher foaming ratio than the first resin; and joining the first memberand the second memberby forming the recessed joint partby pressing and hot-melting the second memberuntil the recessed joint partreaches at least the inside of the first memberfrom the outer surface side of the second member