A discharge container (80, 90, 100, 110) comprising: a container (85, 91, 111); a valve assembly configured to close the container, the valve assembly including a valve mechanism; and a pressure regulating mechanism attached to a lower portion of the valve assembly, the pressure regulating mechanism being configured to raise internal pressure of the container to predetermined pressure when the internal pressure drops, wherein the container (85, 91, 111) and the valve assembly are detachably connected wherein the pressure regulating mechanism includes a cylinder portion provided below the valve assembly and having a closed lower end, a piston vertically slidably inserted in the cylinder portion to divide the cylinder portion into a pressure regulating chamber and an open chamber opened in the container, and a gas container filled with a pressurizing agent and communicated with an inside of the container in conjunction with a vertical movement of the piston, wherein the pressure regulating mechanism includes a container holder accommodated in the container so as to be suspended from an opening of the container, the container holder also serving as the cylinder portion, a communication hole for communicating the inside of the container holder with the inside of the container is formed in the container holder, and the entire gas container is accommodated in and supported by the container holder, when a force received by internal pressure of the container is smaller than a force received from the pressure regulating chamber, the piston moves to open the gas container so that a capacity of the pressure regulating chamber becomes larger than a predetermined capacity to supply the pressurizing agent into the container, and when the force received by the internal pressure of the container is the same or larger than the force received from the pressure regulating chamber, the piston moves to close the gas container so that the capacity of the pressure regulating chamber becomes the same or smaller than the predetermined capacity. a container (85, 91, 111); a valve assembly configured to close the container, the valve assembly including a valve mechanism; and a pressure regulating mechanism attached to a lower portion of the valve assembly, the pressure regulating mechanism being configured to raise internal pressure of the container to predetermined pressure when the internal pressure drops, wherein the container (85, 91, 111) and the valve assembly are detachably connected wherein the pressure regulating mechanism includes a cylinder portion provided below the valve assembly and having a closed lower end, a piston vertically slidably inserted in the cylinder portion to divide the cylinder portion into a pressure regulating chamber and an open chamber opened in the container, and a gas container filled with a pressurizing agent and communicated with an inside of the container in conjunction with a vertical movement of the piston, wherein the pressure regulating mechanism includes a container holder accommodated in the container so as to be suspended from an opening of the container, the container holder also serving as the cylinder portion, a communication hole for communicating the inside of the container holder with the inside of the container is formed in the container holder, and the entire gas container is accommodated in and supported by the container holder, when a force received by internal pressure of the container is smaller than a force received from the pressure regulating chamber, the piston moves to open the gas container so that a capacity of the pressure regulating chamber becomes larger than a predetermined capacity to supply the pressurizing agent into the container, and when the force received by the internal pressure of the container is the same or larger than the force received from the pressure regulating chamber, the piston moves to close the gas container so that the capacity of the pressure regulating chamber becomes the same or smaller than the predetermined capacity.