Method for manufacturing metal-resin joint

A method for manufacturing a metal-resin joint in which a synthetic resin member made of thermoplastic resin and a metal member made of metal are bonded to each other, the method comprising:

• a first process of exposing a surface of the synthetic resin member molded into a predetermined shape, to a gas heated to a first temperature higher than a deflection temperature under load, when a load of 1.8 MPa is applied, of the thermoplastic resin;
• and
• a second process of bonding the surface of the synthetic resin member and a surface of the metal member to each other, wherein
• in the second process, the surface of the synthetic resin member and the surface of the metal member are bonded to each other at a second temperature, which is equal to or higher than the deflection temperature under load, when the load of 1.8 MPa is applied, of the thermoplastic resin and is lower than the first temperature.