This invention relates to a remote lock operation apparatus for a light vehicle without a cabin and having two, three, or four wheels. One objective of the invention is to make it possible for the infrared receiver of a remote lock operation apparatus to cover a range of directivity without being influenced by a seat or a vehicle body rear portion. Another objective is limit the design of the remote lock apparatus to as few as one infrared receiver, thereby reducing the burden to a vehicle battery. In this invention, an infrared receiver is disposed at the center of a vehicle body front half portion in a vehicle widthwise direction with a reception face thereof directed rearwardly. Further, the receiver is placed at a height at which reception of an infrared signal emitted from rearwardly is not disturbed by a vehicle accessory or a vehicle body rear portion on the rear side with respect to the receiver.