Method for manufacturing joined body

2:

• The method for producing a joined body according to claim 1, wherein the resin B is made of a thermoplastic resin.

3:

• The method for producing a joined body according to claim 1, wherein the base material A is made of a metal.

4:

• The method for producing a joined body according to claim 1, wherein in the first joining step, the film is heated to 100° C. to 300° C. to be melt and then solidified.

5:

• The method for producing a joined body according to claim 1, wherein in the second joining step, the film is melted and then solidified by at least one selected from the group consisting of contact heating, warm air heating, hot press, infrared heating, hot plate welding, ultrasonic welding, vibration welding, and high-frequency induction welding.

6:

• The method for producing a joined body according to claim 1, wherein in the second joining step, the film is melted and then solidified by heating at a temperature equal to or higher than a melting point of at least one of the resin B or the film.

7:

• The method for producing a joined body according to claim 1, wherein in the second joining step, the film is melted and then solidified at a heating temperature of 100° C. to 400° C. under a pressure of 0.01 to 20 MPa.