Abstract: A pressurized-fluid control mechanism for controlling the ejection of a compressed carbonic gas C charged into a gas container vessel (3), and a Pressurized-Fluid Supply device that makes use of the pressurized-fluid control mechanism, are disclosed. The pressurized-fluid control mechanism is mounted on the gas container vessel filled with the compressed carbonic gas C to control the ejection of the compressed carbonic gas C charged into the gas container vessel. The pressurized-fluid control mechanism includes a sealing plate (13) that stops up an opening (4) of the gas container vessel, and an acute pointed member (17) provided towards its extreme end. A sealing part (19) progressively reduced in its diameter is formed at an extreme end of the acute pointed member. The pressurized-fluid control mechanism also includes a coil spring (23) that biases the acute pointed member.