To provide a double structure, to make it light and to improve a pressure-resisting tight property by fitting an inner base part on the inside of a base part, providing a disc shape one end side of which is enlarged along the inside of a shoulder part of an inside shell on this inner base part and interpolating the other end side in a cylindrical head part of the base part.

A pressure-resisting container is constituted by fitting an inner base part 7 on the inside of a base part 6. One end side of the inner base part 7 has a disc type part 7a enlarged along the inside of a shoulder part 3a of an inside shell, the other end side is to be an inner base part head part 7b closely interpolated on a base part head part 6b. A female screw is engraved on an inwall surface of the base part head part 6b, a male screw is engraved on an external wall part of the inner base part head part 7b, and both of them are structured to be screwed on each other. Additionally, the inner base part head part 7b closely interpolated on the base part head part 6b has a gas passage 7c communicated to a gas passage 3c. Furthermore, a head end inside of the base part head part 6b is free to continuously provide a nozzle and an orifice at the time of using injected gas as well as an injection port to inject gas in the pressure-resisting container.