To surely prevent a generation of chatter marks and coil break by separating the shaft end part of an upper work roll from a roll coupling in the temper rolling of a metallic strip.

In the temper rolling mill which is provided with the upper work roll 12 the cross-sectional shape of the end part 12a of the roll shaft of which is formed into an elliptic shape and a roll coupling 15 for transmitting driving torque to a spindle 17 by fitting to and connecting with the shaft end part 12a of the roll of the work roll, a fitting/detaching device 25 for executing fitting and detaching of the roll coupling 15 and the shaft end part 12a of the roll and a receiving stand 20 for supporting the spindle 17 when the roll coupling 15 is separated from the shaft end part 12a of the upper work roll are provided.