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1. A pressure reducing valve, comprising:
an open-close valve that switches between connecting and isolating a primary port and a secondary port provided in a body member; a cylinder arranged downstream of the open-close valve, the cylinder communicating with the secondary port; and a piston that divides the cylinder into a pressure reducing chamber and a pressure regulating chamber, wherein the piston moves inside the cylinder according to a difference between force applied from the pressure regulating chamber and force applied from the pressure reducing chamber, thereby opening and closing the open-close valve, the open-close valve includes a valve stem, which is located between the open-close valve and the piston, and a plug, which restrains displacement of the piston toward an upstream side of the open-close valve by abutting on an end surface of the piston, the plug houses the valve stem, and the plug includes a channel hole, through which a housing part for the valve stem communicates with the pressure reducing chamber.
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