A tire pressure gauge includes a body and a gas nozzle assembly pivotally connected with the body. The body includes an enclosure, a PCB assembly disposed in the enclosure, a battery, and a metal connection member; the enclosure includes a front panel, a first axle hole is defined in the first axle bed; the metal connection member includes a second axle bed corresponding to the first axle bed, another first axle hole is defined in the second axle bed, a first threaded embossment is formed on the second axle bed, a swing gap is defined between the first and second axle beds; and the gas nozzle assembly includes a swing head, and a screw passes through the first axle hole, second axle hole, and another first axle hole, and then connects with the first threaded embossment.