To provide a pressure container having simple structure for inexpensive manufacturing and safe use.

The pressure container comprises a pressure container body 2 having a pawled integral shape quickly opening/closing cover device 11, and a frame 41 fitted into a recessed portion 35, the frame 41 having a height almost the same as or greater than a height H1 from the bottom face 39 of a pawl receiving portion of a clamp 15 to the upper end outer wall 36 of the clamp 15 and a sectional size almost the same as the size in one plane view of the recessed portion 35 having a cover plate 13 and the clamp 15 when a pawl 27 of the cover plate 13 and a pawl 19 of the clamp 15 are engaged with each other so that an engagement area becomes the maximum. When the frame 41 is fitted into the recessed portion 35, a cover plate position detecting means 3 having a limit switch 43 or a microswitch mounted to the side face of the frame 41 in which the switch is put abuts on the vicinity of the upper part of the wall face forming the recessed portion 35.

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