Provided is a small stage mechanism with little backlash, little flow in the direction along the axis of the feed screw, and a small size. The stage mechanism 10 includes a transfer screw 11, a fixed stage 13 having a space portion 13a incorporating the transfer screw, a movable stage 15, and a backlash absorbing portion 17, The transfer screw has a first end 11d and a second end 11e, and the stage mechanism further includes a shift prevention portion 19 that prevents the transfer screw from shifting in the direction toward the first end side, and the transfer screw It is provided with a pressing force adjusting section 21 for adjusting the pressing force for pressing in the direction of the first end from the second end side, the shift prevention portion is in contact with the wall 13b of the space portion at the first end side, and the pressing force adjusting portion is The second end is pressed in line contact.
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