The invention relates to a pressure gauge. The pressure gauge comprises a gauge case, a dial, pointers and a switching structure, wherein an introduction hole is formed in the bottom of the gauge case. The pressure gauge is characterized in that the switching structure comprises a transmission rod, a transmission base and a supporting spring, the transmission rod is axially restrained in the gauge case and can rotate around the axis of the transmission rod, external transmission threads are arranged on the transmission rod, and the pointers are fixed to the upper end of the transmission rod; the transmission base is arranged in the gauge case and can move vertically, the transmission base can move upwards under the driving of air pressure, a guiding hole is formed in the transmission base, the transmission rod is arranged in the guiding hole in a penetrating mode, and the hole wall of the guiding hole is provided with internal transmission threads matched with the external transmission threads; the supporting spring acts on the transmission base so that the transmission base can keep the tendency of moving downwards. The switching structure in the pressure gauge is simple and reasonable and good in transmission stability because of thread fit transmission, the pressure gauge is good in anti-shock effect, no complicated lever structure or gear structure is needed, and therefore the pressure gauge can be manufactured to be very small, all the parts are simple in structure, the cooperative relation between the parts is little, and cost is greatly reduced.