To provide a portable machine capable of preventing burglary of a vehicle as a vehicle engine is not driven even when a door panel is unlocked by the illegal, a control device for the vehicle and an electronic key system furnished with them.

The portable machine 2 for remote control has a locking switch 4/an unlocking switch 5 to output locking/unlocking signals to lock/unlock a door lock mechanism 100 by operation of an operator, a battery ON/OFF switch 6 to output a cut-off signal to cut off supply to an engine driving part of a main battery 18 by operation of the operator and a transmission circuit 7A to transmit the locking/unlocking signals and the cut-off signal and the control device 3 for the vehicle has a receiving circuit 16B to receive the locking/unlocking signals and the cut-off signal, a change-over circuit 102 to supply and cut off an electric power source to the engine driving part of the main battery 18 and a control part 17 to cut off the change-over circuit 102 by inputting the cut-off signal from the receiving circuit 16B on the electronic key system 1.

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