PERIMETER MONITORING DEVICE FOR WORK MACHINE

A perimeter-monitoring device (100A) has a human presence determining means (12) configured to determine presence or absence of a human in each of a plurality of monitoring spaces located around the shovel (60) and an alarm controlling means (13) configured to control a plurality of alarm output parts (7) that are located in a cab (64) of the shovel (60) and emit an alarm to an operator. The alarm controlling means (13) causes a right alarm output part (7R) to emit an alarm when it is determined that a human exists in a right monitoring space (ZR), causes a left alarm output part (7L) to emit an alarm when it is determined that a human exists in a left monitoring space (ZL), and causes a back alarm output part (7B) to emit an alarm when it is determined that a human exists in a back monitoring space (ZB).