To provide a balancer device that measures a load of an object W and vertically moves the object W with optimal force, moving speed and travel.

The balancer device 1 comprises a balance cylinder 7, a balance cylinder drive controlling part 9 having a load variation follow-up function and for controlling the balance cylinder, an operating drive part 13 operated by a pendant operating part 6b, and a switching means 12 for switching a wire 4 between the balance cylinder 7 and the operating drive part 13 via the pendant operating part 6b. According to information from a load sensor 8 and a balance cylinder sensor 11, the load variation follow-up function computes optimal force, moving speed and travel for the object W, and drivingly commands the balance cylinder 7.