Abstract: A collapsible elevating board for insertion between the spring and mattress of a bed for raising one end of the mattress. The elevating board has a flat base and a tiltable member pivotally connected on the forward end to the base. A transverse foot, having both an extended and a retracted position, is pivotally attached to the lower side of the tiltable member. A pivoted riser on the flat base, disposed below the transverse foot, is provided with both an upright and a collapsed position. The riser is adapted in both its upright and collapsed positions, to holdably engage the transverse foot when it is fully extended so as to provide selective alternate elevations for the tiltable member and the bed mattress thereon supported.