Abstract: A pressure gas container includes a liner to store a gas, a reinforcing layer provided on an outer side of the liner, a boss attached to the liner, and an attachment attached to an outer surface of the liner. The boss has an opening through which the gas is introduced into the liner and through which the gas inside the liner is released. The attachment is to support the liner rotatably when the reinforcing layer is provided. At least one of the boss and the attachment has a gas release channel that allows communication between a gap formed between the outer side and an inner side of the reinforcing layer and a space outside the pressure gas container to release the gas having permeated through the liner and present in the gap between the liner and the reinforcing layer to the space.