TIRE AIR PRESSURE ALARM SYSTEM

To provide a tire air pressure alarm system that can detect a state of tire air pressure during stoppage of a vehicle which is capable of receiving keyless entry transmitted from a portable machine.SOLUTION: A communication control device 30 controls reception of an on-vehicle receiver 22 so that the on-vehicle receiver 22 receives a second radio signal during travel of a vehicle 100, and controls reception of the on-vehicle receiver 22 so that the on-vehicle receiver 22 receives a first radio signal during stoppage of the vehicle 100. Further, the communication control device switches selection of reception of the on-vehicle receiver 22 so that the second radio signal is received in a preset period.SELECTED DRAWING: Figure 4 【課題】携帯機から送信されるキーレスエントリが受信可能となる車両の停車中において、タイヤの空気圧の状態を検出することができるタイヤ空気圧警報システムを提供する。【解決手段】通信制御装置３０は、車両１００の走行時には、車載受信機２２に前記第２無線信号を受信させるように、車載受信機２２の受信を制御し、車両１００の停車時には、車載受信機２２に第１無線信号を受信させるように、車載受信機２２の受信を制御するとともに、予め設定された期間、第２無線信号を受信するように、車載受信機２２の受信の選択を切り替える。【選択図】図４