To provide a dynamic balancing machine capable of changing the intervals between rollers with a simple configuration, measuring unbalance of a large number of types of devices under test, and performing accurate unbalance measurements.

By raising bearing racks 5 and 6 at the same oscillating frame 4, connecting the bearing racks 5 and 6 to each other with a feed-screw shaft 26, and moving the bearing racks 5 and 6 by the movement of the feed-screw shaft 26 by a motor 29 for movement, it is possible to adjust the interval between rollers 7a and 8a and the interval between rollers 7b and 8b according to the length of a device under test 11. Since no constituent parts are arranged between the rollers 7a and 7b nor between rollers 8a and 8b in the dynamic balancing machine 1, it is possible to measure unbalance of the device under test 11 having a protrusion part 35. Since a motor 18 for drive is movable with the bearing rack 5, it is possible to accurately measure unbalance.

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