Abstract: There is provided a pressurized container provided with sealing members which can be manufactured at a low cost, minimally causes a defect, and can increase sealing property by making use of a pressure of a fluid in the pressurized container. The pressurized container (1k) has the structure where an annular space portion (16) is formed between facing surfaces of sealing members (7, 7), an air supply/discharge hole (17) is provided so as to adjust an inner pressure in the annular space portion (16), and air supply/discharge means (18) is connected to the air supply/discharge hole (17). The sealing members (7) are formed such that an area of a sealing surface (5a) is smaller than an area of a pressure receiving surface (5b).