Resin joined body manufacturing method

A resin joined body manufacturing method of manufacturing a resin joined body in which two resin molded bodies made of different fluororesin materials are joined to each other, said resin joined body manufacturing method comprising:

• a step of forming a first resin assembly having a cylindrical accommodation portion from a first fluororesin material that is capable of gelling and maintaining a shape even at a temperature equal to or higher than a melting point thereof;
• a step of accommodating a second resin assembly in the accommodation portion, said second resin assembly made of a second fluororesin material that is melted to be in a liquid state at a temperature equal to or higher than a melting point thereof;
• and
• a step of heating the first resin assembly having the second resin assembly accommodated in the accommodation portion thereof, to a temperature equal to or higher than the melting points of the first fluororesin material and the second fluororesin material, and then cooling the first resin assembly and the second resin assembly to change the first resin assembly to a first resin molded body and change the second resin assembly to a second resin molded body while joining the first resin molded body and the second resin molded body to each other.