To provide a mounting fixture of an air pressure sensing system for a tire which is capable of easily attaching/detaching a protective case to/from the mounting fixture and firmly mounted without any play.

The mounting fixture includes a mounting piece 3 to be assembled to a metal belt 2 fixed to a well 6 of a wheel 5, and a protective case 1 to be attachably/detachably mounted on the mounting piece 3. Next, the mounting piece 3 includes a substrate 10 with the protective case 1 placed thereon, leg parts 11, 11 with through holes 16, 17 for passing the metal belt 2, and abutting parts 12, 12 to be abutted on a bottom face of the well 6 of the wheel 5. In this case, the protective case 1 is held by a locking part 19 and a regulation part 15 of the mounting piece 3, and the protective case 1 is movable by depressing the locking part 19. In addition, fitting projections 23, 25 are protruded on the right and left sides of the protective case 1, and locking parts 20, 21 are protruded upwardly on the right and left sides of the substrate 10 of the mounting piece 3. The locking parts 20, 21 can fit the fitting projections 23, 25 of the protective case 1 while enabling the sliding movement in the longitudinal direction of the protective case 1.

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