LOAD TESTING DEVICE

A load testing device capable of a load test without preparing an ancillary power source and without stopping a cooling fan and the like is provided.A load testing device 1 includes: a resistance unit 20; a cooling fan 10 that cools the resistance unit 20; a circuit breaker 50; a first terminal part 55a that is connected to a test target power source; and a charge/discharge unit 40 that has a charger 43 and a first power storage device 45a. The charge/discharge unit 40 is connected with a test target power source cable c1 being between the first terminal part 55a and the resistance unit 20, between the first terminal part 55a and the circuit breaker 50. The first power storage device 45a stores electric power supplied from the test target power source. The cooling fan 10 drives based on electric power from at least the charge/discharge unit 40.