Vehicular remote control system and tire pressure monitoring system

In a vehicular smart entry system, it is to shorten a delay time from the time a trigger occurred to the time a locking/unlocking operation of a door is performed. When a request signal is transmitted from a transmission antenna at a position where the trigger occurred (for example, the right exterior antenna 25), an interrupt signal (an inverse signal with a pulse string at the modulation inverted with respect to the request signal) for preventing reception of the request signal at any other position than the above position is transmitted from the transmission antenna (for example, left exterior antenna) arranged at any other position than the above position, simultaneously with the request signal.