To provide a pressure regulating valve which can be used in both high pressure specification and low pressure specification.

A grip 16 screwed with a spring cylinder 14 is screwed in the spring cylinder. Thereby, a spring 12 in the spring cylinder 14 is compressed and a load is generated on the spring 12. While the load is acted on the valve 6, a liquid is passed between the valve 6 and a valve seat 4 to generate a pressure, and the grip 16 is locked at each predetermined interval of a screwed amount of the grip 16 to gradually set the pressure corresponding to the respective locking positions. Front and rear surfaces of the valve seat 4 have different opening diameters D1, D2.