Vertical mill

A vertical mill comprising:

• a housing having a hollow shape;
• a mill table rotatably supported in the housing by a support shaft center along a vertical direction;
• a mill roller provided above the mill table and rotatably supported by a first support shaft, the mill roller being capable of rotating with an external peripheral surface of the mill roller coming into contact with an upper surface of the mill table;
• a support arm for supporting the first support shaft, the support arm being swingably supported on the housing by a second support shaft with the external peripheral surface of the mill roller coming close to or moving away from the upper surface of the mill table;
• and
• a reaction force load giving device having a dumper filled with a magnetorheological fluid and magnetizing the magnetorheological fluid so as to give a reaction force load to the mill roller via the support arm, the reaction force load being given against a direction in which the mill roller moves away from the mill table.