To provide a vehicle theft arrester wherein there is no possibility for a malfunction to occur, there is no need for an alarm canceling switch to be operated within a fixed time when the owner of a vehicle boarded the vehicle, and interest needs not to be paid to power consumption.

A locking structure for bolt comprises a bolt 5 having an engaging protrusion 6 at the tip portion side 5a, a guide groove 2 arranged extendingly in a longitudinal direction of a threaded hole 1 with which the bolt 5 threadedly engages, a locking member 3 which is movable along the guide groove 2 and has a locking protrusion 9 which allows revolution in the bolt tightening direction of the engaging protrusion 6 but prevents revolution in the direction of deflection, and an actuation means 4 which urges the locking member 3 in the direction of pressing the bolt 5.