Abstract: An adjustable tire pressure detector is installed on a tire rim, and includes a detector body, a gas intake nozzle, and a gas nozzle assembly member for fastening the gas intake nozzle onto the detector body. The detector body includes a housing and a gas nozzle assembly portion. The gas nozzle assembly portion includes two parallel limiting contact surfaces, an assembly surface connecting the two limiting contact surfaces and including an opening, and an assembly space surrounded by the two limiting contact surfaces and the assembly surface. The gas intake nozzle includes a coupling section inserted in the assembly space and a gas intake section connected to the coupling section. The coupling section includes two assembly contact surfaces corresponding to the limiting contact surfaces, and an arched assembly surface connecting the two assembly contact surfaces, including a ventilation hole and being in line contact with the assembly surface.