PURPOSE: To reduce the wasteful use of grease and the labor of a worker in work to coat the inner surface of a hub with grease.

CONSTITUTION: At a first station 21, work classification judgment is performed by a classification judging device 23 and conveyance to a second station 31 is conducted. At a second station 31, a work 20 is stopped at a given position responding to a classification and centering is conducted for fixing. After a hub 2 is lifted upward, the tip of a vertical running unit 93 is lowered into the hub 2 to measure the inner surface shape of the hub 2. Based on measurement data, vertical and horizontal movement operation of the vertical running unit 93 and a horizontal running unit 92 and work rotation operation of a work rotating jig at the lower part of the second station are controlled by a computer. An amount of grease fed through the nozzle of a force-feed pipeline member 94 arranged at the tip of a vertical running unit 93 is controlled to automatically coat the inner surface of the hub with the grease in a desired forming shape.