A vehicular burglar-proof system includes (i) a plurality of alarm unit, (ii) a detection unit for detecting movement, opening, and closing of a movable body, and (iii) a control unit connected to the plurality of alarm unit and the detection unit. A predetermined operation of the movable body allows the control unit to turn off the plurality of alarm unit or change the alarm unit into a predetermined alarming state. This structure can provide a user-friendly vehicular burglar-proof system in which an alarming state can easily be selected according to the use.