In a vertical mill, a mill table is supported in a housing by a support shaft center, which is along a vertical direction, in such a manner as to be driven and rotated, and above the mill table, a mill roller is rotatably supported by a first support shaft, and the mill roller is capable of rotating the mill table in such a manner that an external peripheral surface of the mill roller comes into contact with an upper surface of the mill table, and a support arm configured to support the first support shaft is swingably supported on the housing by a second support shaft, in such a manner that the mill roller can come close to or move away from the mill table, and a reaction force load giving device is provided that has a dumper filled with a magnetorheological fluid and magnetizes the magnetorheological fluid.