Patent ID: 8493352

Claim:
A portable device mounted on a vehicle which transmits an operating instruction in the form of a radio wave to a vehicle-side device which operates according to the operating instruction for a period of time in which the vehicle-side device continues to receive the operating instruction, the portable device comprising: a push operating switch corresponding to the operating instruction; a radio wave transmitting portion which transmits the operating instruction in the form of the radio wave; a control portion which makes the radio wave transmitting portion transmit the operating instruction in the form of the radio wave in response to the depression of the push operating switch; a battery supplying electric power; and a touch sensor which operates upon supply of the electric power from the battery to sense a user's touch; wherein the control portion supplies the electric power from the battery to the touch sensor for a predetermined period of time based on operation of the push operating switch; the radio wave transmitting portion starts to transmit the operating instruction in the form of the radio wave in correspondence with the push operating switch based on the fact that the touch sensor is sensing the user's touch and the push operating switch is being depressed; and the operating instruction continues to be transmitted in the form of the radio wave in correspondence with the push operating switch as long as the user's touch is being sensed by the touch sensor after start of the transmission even if the push operating switch is not operated.