PROBLEM TO BE SOLVED: To monitor a theft of a work vehicle without imposing a heavy load on an operator while preventing being warned in spite of the fact that the work vehicle is not being stolen.SOLUTION: A theft monitoring system includes a work time zone setting part 12 for freely setting a work time zone, a time detection part 13 for detecting an operation starting time and an operation ending time of a work vehicle 10, a determination part 21 for determining whether an operation time zone from the operation starting time to the operation ending time detected by the time detection part 13, and the work time zone set by the work time zone setting parts 12 and 31 are in the overlapping state, or in the non-overlapping state, and a notification part 22 that notifies of a theft of the work vehicle 10 when the non-overlapping state is determined by the determination part 21, and does not notify of a theft of the work vehicle 10 when the overlapping state is determined by the determination part 21.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】作業者に大きな負担をかけることなく、盗難ではないにもかかわらず、警報されてしまうことを防止しながら、作業車の盗難を監視すること。【解決手段】作業時間帯を設定自在な作業時間帯設定部12と、作業車10の稼動開始時刻及び稼動終了時刻を検知する時刻検知部13と、時刻検知部13にて検知する稼動開始時刻から稼動終了時刻までの稼動時間帯と作業時間帯設定部12,31にて設定する作業時間帯とが重複する重複状態であるか又は非重複状態であるかを判定する判定部21と、その判定部21にて非重複状態であると判定された場合に、作業車10の盗難を報知し、判定部21にて重複状態であると判定された場合に、作業車10の盗難を報知しない報知部22とが備えられている。【選択図】図2
