Molding device of inbuilt component fixing section of fuel tank

A molding device of an inbuilt component fixing section of a fuel tank, the molding device comprising:

• a projection member that projects out at a placement face onto which a resin sheet that will form a tank configuration member of a tank main body is disposed in a molten state, and that molds a hollow bulge section in the resin sheet;
• an elastic body that covers an outer periphery of the projection member, and that expands and applies pressure to the bulge section from the inside due to a non-compressible fluid being supplied into a sealed space formed between the elastic body and the projection member;
• a fluid supply device that is configured to supply the fluid into the sealed space and is configured to recover the fluid from the sealed space, and that supplies the fluid into the sealed space in a state in which the bulge section has penetrated through a fixing hole provided in an inbuilt component;
• and
• a fixing member that is attached to a leading end portion of the projection member and that fixes a location of the elastic body, corresponding to the leading end portion, to the leading end portion.