To provide an electronic device starter that does not waste electric power while it is not being used and a vehicle tire monitoring system in which the starter is used for eliminating waste of electric power of batteries for its detectors. In a vehicle tire monitoring system according to the present invention, a monitor unit sends a start signal at time intervals T1 by using an electromagnetic wave, a rectifier circuit 33 in a detector 3 which received the start signal converts a high-frequency electromotive force caused by the start signal at an antenna 31 into electric energy, this electric energy operates a central processing section 34, a detector section 35, and a transmitting section 36, the central processing section 34 which started operating places an FET 382 in the on state to supply electric power from a battery 381 to a sensor section 37 to operate the sensor section 37.

 
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