A rolling mill comprising: first and second rolls (12A, 12B) adjacent to each other; a first axle box rotatably supporting a shaft of the first roll; a second axle box rotatably supporting a shaft of the second roll and adjacent to the first axle box; an adjustment part configured to adjust a position of the first axle box so as to bring the first roll and the second roll close to or apart from each other; a sensor unit interposed between the first axle box and the second axle box and in contact with both the first axle box and the second axle box; a control unit, wherein the sensor unit includes a distance sensor including an extension/contraction part configured to extend and contract in one direction in which the first and second axle boxes (14A, 14B) are aligned, and the control unit is configured to control the adjustment part based on an extension/contraction amount of the extension/contraction part, the sensor unit further includes: a first member holding the distance sensor; and the rolling mill is characterized in that the sensor unit further includes a second member abutting on the extension/contraction part and attached to the first member slidably along the one direction, one of the first and second members (36, 38) is fixed to one of the first and second axle boxes (14A, 14B), and the other of the first and second members (38, 36) is not fixed to the other of the first and second axle boxes (14B, 14A) and includes a contact surface that is movable within a surface of the other of the first and second axle boxes (14B, 14A) while abutting on the surface. first and second rolls (12A, 12B) adjacent to each other; a first axle box rotatably supporting a shaft of the first roll; a second axle box rotatably supporting a shaft of the second roll and adjacent to the first axle box; an adjustment part configured to adjust a position of the first axle box so as to bring the first roll and the second roll close to or apart from each other; a sensor unit interposed between the first axle box and the second axle box and in contact with both the first axle box and the second axle box; a control unit, wherein the sensor unit includes a distance sensor including an extension/contraction part configured to extend and contract in one direction in which the first and second axle boxes (14A, 14B) are aligned, and the control unit is configured to control the adjustment part based on an extension/contraction amount of the extension/contraction part, the sensor unit further includes: a first member holding the distance sensor; and the rolling mill is characterized in that the sensor unit further includes a second member abutting on the extension/contraction part and attached to the first member slidably along the one direction, one of the first and second members (36, 38) is fixed to one of the first and second axle boxes (14A, 14B), and the other of the first and second members (38, 36) is not fixed to the other of the first and second axle boxes (14B, 14A) and includes a contact surface that is movable within a surface of the other of the first and second axle boxes (14B, 14A) while abutting on the surface. a first member holding the distance sensor; and the rolling mill is characterized in that the sensor unit further includes a second member abutting on the extension/contraction part and attached to the first member slidably along the one direction, one of the first and second members (36, 38) is fixed to one of the first and second axle boxes (14A, 14B), and the other of the first and second members (38, 36) is not fixed to the other of the first and second axle boxes (14B, 14A) and includes a contact surface that is movable within a surface of the other of the first and second axle boxes (14B, 14A) while abutting on the surface.