FUEL TANK

A fuel tank includes: an internal component including a head portion, a neck portion, and a shoulder portion. The internal component is fixed on the tank main body by shaping a parison to the head portion, the neck portion and the shoulder portion during molding of the tank main body. At least one of the head portion and the neck portion includes a bottom portion (a fuse-shaped portion) configured to be broken near a boundary between the head portion and the neck portion.