Abstract: In a rolling mill (101) with upper and lower drive motors (174 and 184) arranged oppositely to each other with respect to paired upper and lower work rolls (131 and 141), changing of the upper work roll (131) is carried out such that a changing carriage (400) is inserted from a lower drive motor side to a space in the rolling mill (101) provided by the lower work roll (141) extracted from the rolling mill (101) to an upper drive motor side, the upper work roll (131) being loaded on the changing carriage (400) and then extracted together therewith to the lower drive motor side.