Patent ID: 7987706

Claim:
A tire air-pressure sensor characterized by being so configured that said tire air-pressure sensor is arranged and fixed in a wheel with its outer side in a radial direction of the wheel located as a crest side; that two air holes are formed in a crest portion of a case of said tire air-pressure sensor in a manner to be positionally shifted in a rotating direction of the wheel; that an opening of an air vent hole communicating with an air-pressure sensor element is formed in a cap which is put on the air-pressure sensor element arranged in the case, at an intermediate position between the two air holes in the rotating direction; that the two air holes and the opening of the air vent hole are brought into communication by a communication passage on a substantial plane normal to the radial direction of the wheel, between the crest portion of the case and the cap; and that walls are interposed between the air holes and the opening of the air vent hole so as to bring the communication passage into a meandering state.