The present invention simplifies the preload adjustment operation and reduces the number of parts by simplifying the structure of the collar by sliding the slide bearing housing between the bearing supporter supporting the opposite side of the ball screw connected to the servomotor and the bearing. A ball screw preload adjusting device, comprising: a bearing supporter fixed to a bearing (32) (33) supporting an opposite end of a ball screw (31) to which a servo motor (30) is attached, and fixed to a machine body (35). A slide bearing housing (40) slid axially in the bearing supporter (36) together with the ball screw (31) while being slid to (36) and supporting the bearings (32) and (33); The collar 50 is interposed between the bearing housing 40 and the end face of the bearing supporter 36 to apply an axial preload to the ball screw 31.
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