Patent ID: 7339461

Claim:
A tire inflation pressure monitoring device, comprising: a tire inflation pressure detecting section provided on a tire side, said tire inflation pressure detecting section detecting a tire inflation pressure, said tire inflation pressure detecting section including: an inflation pressure sensor, said inflation pressure sensor detecting the tire inflation pressure; and a transmitting unit, said transmitting unit transmitting by radio a result of detection of the tire inflation pressure from said inflation pressure sensor; and a tire inflation pressure diagnosing section provided on a vehicle body side, said tire inflation pressure diagnosing section receiving the result of detection of the tire inflation pressure from said inflation pressure sensor, calibrating the result of detection of the tire inflation pressure to an inflation pressure at a reference atmospheric pressure, and diagnosing the calibrated inflation pressure, said tire inflation pressure diagnosing section including: a receiving unit, said receiving unit receiving the result of detection of the tire inflation pressure from said transmitting unit; an inputting unit, said inputting unit inputting position information on a present position; an atmospheric pressure detector, said atmospheric pressure detector detecting an atmospheric pressure at the present position according to the position information input by said inputting unit; and a calibrating unit, said calibrating unit calibrating the result of detection of the tire inflation pressure to the inflation pressure at the reference atmospheric pressure according to the atmospheric pressure detected by said atmospheric pressure detector.