Operating time measurement method and operating time measuring device

摘要

PROBLEM TO BE SOLVED: To provide a technique for easily measuring an operating time of a work vehicle. An illuminance sensor 3 is attached to a position where the light of a back lamp 103 that lights up when a forklift 100 executes an article transporting operation reaches. The operating time of the forklift 100 is measured from the lighting status of the back lamp 103 by the illuminance sensor 3. [Selection diagram] Fig. 1