A rolling mill of four-high or more that includes a plurality of rolls (1,2,3,4) including at least a pair of work rolls (1,2) and a pair of backup rolls (3,4) supporting the work rolls (1,2), in which any one roll among respective rolls (1,2,3,4) arranged in a vertical direction is adopted as a reference roll, comprising: a load detection apparatus (28a,28b,29a,29b) which, at a rolling support point position (30a,30b) on a work side and a drive side of the backup rolls (3,4), detects a vertical roll load that acts in the vertical direction of the rolls (1,2,3,4); a pressing apparatus (9,10,13,40) which, with respect to at least roll chocks (5a,5b,6a,6b,7a,7b) of the rolls (1,2,3) other than the reference roll, is provided on either one of an entrance side and an exit side in a rolling direction of a workpiece, the pressing apparatus (9,10,13) pressing the roll chocks (5a,5b,6a,6b,7a,7b) in the rolling direction; a driving apparatus (11,12,14) which, with respect to at least roll chocks (5a,5b,6a,6b,7a,7b) of the rolls (1,2,3) other than the reference roll, is provided so as to face the pressing apparatus (9,10,13) in the rolling direction, the driving apparatus (11,12,14) moving the roll chocks (5a,5b,6a,6b,7a,7b,) in the rolling direction; and a position control unit which fixes a rolling direction position of roll chocks (8a,8b) of the reference roll as a reference position, and drives the driving apparatus (11,12,14) to control positions in the rolling direction of the roll chocks (5a,5b,6a,6b,7a,7b) of the rolls (1,2,3) other than the reference roll so that a vertical roll load difference that is a difference between a vertical roll load detected by the load detection apparatus (28a,29a) on the work side and a vertical roll load detected by the load detection apparatus (28b,29b) on the drive side becomes a value within an allowable range. in which any one roll among respective rolls (1,2,3,4) arranged in a vertical direction is adopted as a reference roll, comprising: a load detection apparatus (28a,28b,29a,29b) which, at a rolling support point position (30a,30b) on a work side and a drive side of the backup rolls (3,4), detects a vertical roll load that acts in the vertical direction of the rolls (1,2,3,4); a pressing apparatus (9,10,13,40) which, with respect to at least roll chocks (5a,5b,6a,6b,7a,7b) of the rolls (1,2,3) other than the reference roll, is provided on either one of an entrance side and an exit side in a rolling direction of a workpiece, the pressing apparatus (9,10,13) pressing the roll chocks (5a,5b,6a,6b,7a,7b) in the rolling direction; a driving apparatus (11,12,14) which, with respect to at least roll chocks (5a,5b,6a,6b,7a,7b) of the rolls (1,2,3) other than the reference roll, is provided so as to face the pressing apparatus (9,10,13) in the rolling direction, the driving apparatus (11,12,14) moving the roll chocks (5a,5b,6a,6b,7a,7b,) in the rolling direction; and a position control unit which fixes a rolling direction position of roll chocks (8a,8b) of the reference roll as a reference position, and drives the driving apparatus (11,12,14) to control positions in the rolling direction of the roll chocks (5a,5b,6a,6b,7a,7b) of the rolls (1,2,3) other than the reference roll so that a vertical roll load difference that is a difference between a vertical roll load detected by the load detection apparatus (28a,29a) on the work side and a vertical roll load detected by the load detection apparatus (28b,29b) on the drive side becomes a value within an allowable range. a load detection apparatus (28a,28b,29a,29b) which, at a rolling support point position (30a,30b) on a work side and a drive side of the backup rolls (3,4), detects a vertical roll load that acts in the vertical direction of the rolls (1,2,3,4); a pressing apparatus (9,10,13,40) which, with respect to at least roll chocks (5a,5b,6a,6b,7a,7b) of the rolls (1,2,3) other than the reference roll, is provided on either one of an entrance side and an exit side in a rolling direction of a workpiece, the pressing apparatus (9,10,13) pressing the roll chocks (5a,5b,6a,6b,7a,7b) in the rolling direction; a driving apparatus (11,12,14) which, with respect to at least roll chocks (5a,5b,6a,6b,7a,7b) of the rolls (1,2,3) other than the reference roll, is provided so as to face the pressing apparatus (9,10,13) in the rolling direction, the driving apparatus (11,12,14) moving the roll chocks (5a,5b,6a,6b,7a,7b,) in the rolling direction; and a position control unit which fixes a rolling direction position of roll chocks (8a,8b) of the reference roll as a reference position, and drives the driving apparatus (11,12,14) to control positions in the rolling direction of the roll chocks (5a,5b,6a,6b,7a,7b) of the rolls (1,2,3) other than the reference roll so that a vertical roll load difference that is a difference between a vertical roll load detected by the load detection apparatus (28a,29a) on the work side and a vertical roll load detected by the load detection apparatus (28b,29b) on the drive side becomes a value within an allowable range.