PRESSURE REGULATOR

In regulators, prevent functional loss due to tilting of a piston pressure regulating valve (7). At least a pair of annular bearings (10a, 10b) made of a rigid synthetic resin are interposed along a length direction of a pressure regulating valve body (5) at a predetermined distance at a position on a valve seat side in an axial direction of a gap (9) formed between the pressure regulating valve body (5) and an inner wall (25) of a passage (2) formed in a body main body (1).