To provide a storage container for storing waste which has a gas valve for injecting and sealing an inactive gas after storing the waste and causes no leak of the gas in the welding of a seal at an inlet of the gas valve.

The storage container 1 for storing the waste is made by placing the gas valve 3 in an upper lid 2 of the storage container 1. The gas valve 3 has two upper and lower chambers 4 and 5. In the upper chamber 4, a bar-shaped valve 8 pressed against a through hole 12a formed in an upper plate 12 of the chamber 4 by a spring 7 is placed. In the lower chamber 5, a spherical valve 10 pressed against a through hole 14a formed in an intermediate plate 14 dividing the upper and lower chambers 4 and 5 by a spring 9 is placed. Moreover, the gas valve 3 is constituted by forming a gap (g) between a protrusion 8d at the lower end of the bar-shaped valve 8 and the spherical valve 10. When a gas is injected, the gas valve 3 is opened by allowing the protrusion 8d of the bar-shaped valve 8 to push down the spherical valve 10. In the welding of the seal, each of the valves 10 is closed with the gap (g) by being pushed up with the springs 7 and 9.