<p>A spinous process spacer that without being fabricated on a made-to-order basis for each patient, realizes stable insertion fixing in a division plane interspace of divided spinous process with no gap. There is provided spinous process spacer (1) for insertion in divided spinous process interspace resulting from longitudinal division of the spinous process, comprised of a plane formed into an approximately circular cylinder, the plane having two end faces (2,3) with a given angle therebetween.</p>
