A pressure gauge structure contains: a body, a positioning sleeve, outlet unit, a fixing member, and a guiding seat. The body includes a chamber and an abutting rib, and the abutting rib has a circular orifice and a noncircular locating rim. The positioning sleeve includes a locking portion retaining with the noncircular locating rim of the body, and the positioning sleeve also includes a connecting hole defined in the top thereof and aligning with the circular orifice. The outlet unit includes a coupling section inserted into the connecting hole from the circular orifice. The fixing member includes an aperture and is fitted and engaged in the positioning sleeve and connected with the coupling section to guide rotation of the outlet unit and to limit removal of the coupling section from the body. The guiding seat is fixed in the chamber and retains with the positioning sleeve.