To widen the application range in the low load side of a mill.

In the vertical roller mill in which primary air A is introduced into a primary air chamber 11 formed at a lower part position of a table 7 for pulverization through a primary air supply duct 10 and the primary air A is supplied to a pulverization chamber 2 in a mill casing 1 through a blowing port 12 positioned in the outer circumferential part of the table 7 for pulverization, a bypass duct 21 is communication connected between the primary air supply duct 10 and the pulverization chamber 2. A bypass flow rate adjustment damper 23 is installed in the middle of the bypass duct 21 so as to directly supply some of primary air A to the pulverization chamber 2 from the primary air supply duct 10 through the bypass duct 21 depending on the load on the mill.