To solve the problem that a subject-fixing band has to be pulled off from a Velcro (R) tape stuck to a top plate and positioned whenever the position of the subject-fixing band is changed correspondingly to the body shape of the subject in the case of fixing the subject to the top plate, and that fixing of the subject is sometimes insufficient when the patient is smaller than the width of the top plate.

In a bed for treatment equipment, a plurality of rails 4 with hook-shaped cross sections are pasted to the top plate 3 in the direction of a width. At the tip of the band, a hook of a shape which can be caught by the rails and which can be moved along the rails is fitted. This hook has a form to be attachable to and detachable from the rails. The rail is selected correspondingly to the size of the subject and the band is slid correspondingly to the body shape of the subject to sufficiently fix the subject to an optional position.