To prevent the damage of a transfer device or long-time interruption of a machine by discovering the clogging in a discharge part in its early stages, in the discharge monitor device of a crusher, and a discharge monitoring system.

In the crusher 1 equipped with a crushing device 10 for crushing a crushing target, a supply device 20 for supplying the crushing target to the crushing device 10 and the transfer device 30 for discharging the crushing target crushed by the crushing device 10 to the outside and characterized in that the crushing device 10 has an introducing port 10a into which the crushing target is introduced from the supply device 20 and a discharge port 10b for discharging the crushing target to the transfer device 30, the discharge part 50 between the discharge port 10b and the transfer device 30 is equipped with an imaging means 52 for monitoring the discharge state of the crushing target and a removing means 53 for removing the dust caused in the discharge part 50 from the monitor region of the imaging means 52.