The invention provides a vertical grinder capable of regularly regulating the layer thickness of a raw material and inhibiting abnormal vibration so as to efficiently micro-grind the raw material. The vertical grinder (1) comprises a rotating millstone (7), a chute (19), a taper body (18) and a scraper (15), wherein the rotating millstone (7) is provided with a central region (11) for holding supplied raw material and a grinding roller rolling region (13) for the rolling of a grinding roller (21) and an auxiliary roller (22); the chute (19) is used for supplying the new raw material to the central region; the taper body (18) is used for supplying the internally circulated raw material to the central region; and the scraper (15) is installed and fixed at the lower end part of the taper body through a support shaft (17) and used for stirring the raw material on the central region. The layer thickness of the raw material on the rotating millstone is fixed into the height of a gap (59) between the scraper and the rotating millstone and is regulated by using the height of a material retaining ring (47). In the grinding roller rolling region, the raw material layer is exhausted by the auxiliary roller and then micro-ground by the grinding roller.