A spindle unit for a rolling mill comprising: a pair of upper and lower drive shafts disposed between a pair of upper and lower rolls and a drive source that rotates the rolls in opposite directions; a pair of upper and lower cross joints (11, 12) disposed between the rolls and the roll-side paired end portions of the drive shafts, or between the drive source and the drive source-side paired end portions of the drive shafts; and a pair of upper and lower tubular yokes (13, 14, 15, 16) each having a connection portion formed at one axial end portion of the corresponding yoke and connected to a corresponding one of the cross joints (11, 12), and each having a fitting hole into which another member is press-fitted, the fitting hole being formed in the other axial end portion of the corresponding yoke and the fitting hole having a non-circular sectional shape around an axis of the corresponding yoke, wherein each of the cross joints (11, 12) includes a joint spider that has four shaft portions arranged in a cross shape as a whole, the joint spider being rotatable about a central axis that coincides with the axis of the corresponding yoke, a plurality of rolling elements that roll on outer peripheral faces (21b1) of the shaft portions, four bottomed cylinder-shaped bearing cups fitted respectively on the shaft portions via the rolling elements, and bearing holders having fitting portions that are disposed between the bearing cups adjacent to each other and to which the connection portion of the corresponding yoke is fitted, recessed portions are defined between the adjacent bearing cups of each of the cross joints (11, 12) such that outer faces (25a1)of the fitting portions are recessed toward the central axis from outer faces (24b2) of bottom portions of the bearing cups, and the cross joints (11, 12) are disposed with a prescribed phase difference in a rotational direction around the central axis such that the outer face of one of the bearing cups of one of the cross joints (11, 12) is inserted in one of the recessed portions of the other one of the cross joints (11, 12), the spindle unit for a rolling mill characterized in that the yokes (13, 14, 15, 16) are formed such that formation positions of the fitting holes with respect to the connection portions coincide with each other, whereas the fitting holes of the yoke are formed such that longitudinal central lines (prescribed central lines) thereof are tilted by a prescribed angle θ with respect to corresponding central axes of the two shaft portions on which the paired bearing holders, to which the corresponding yokes are connected, are disposed, in the same direction about the central axis. a pair of upper and lower drive shafts disposed between a pair of upper and lower rolls and a drive source that rotates the rolls in opposite directions; a pair of upper and lower cross joints (11, 12) disposed between the rolls and the roll-side paired end portions of the drive shafts, or between the drive source and the drive source-side paired end portions of the drive shafts; and a pair of upper and lower tubular yokes (13, 14, 15, 16) each having a connection portion formed at one axial end portion of the corresponding yoke and connected to a corresponding one of the cross joints (11, 12), and each having a fitting hole into which another member is press-fitted, the fitting hole being formed in the other axial end portion of the corresponding yoke and the fitting hole having a non-circular sectional shape around an axis of the corresponding yoke, wherein