| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a monitoring device for a construction machine that continues to output an alarm when it can be determined that a heat source is present nearby a construction machine even in the case that the heat source stops within a detection range of a pyroelectric infrared sensor and cannot be detected.SOLUTION: A monitoring device 100 has an alarm control part 11 which controls an alarm output part 7 based upon a determination result of a person presence/absence determination part 10. The person presence/absence determination part 10 determines that a person is present nearby a shovel 60 when a short-distance sensor 6C detects a person OBJ, determines that the person moves away from nearby the shovel 60 when a long-distance sensor 6F detects the person OBJ while the short-distance sensor 6F misses the person OBJ after detecting the person OBJ, and also continues to determine that the person is present nearby the shovel 60 unless the long-distance sensor 6F detects the person OBJ.</p> |
