Abstract: A pillow height adjusting device for adjusting the height of a pillow relative to a supporting surface such as a mattress. The device includes a base component for resting on the mattress and a supporting platform for supporting the pillow. A mechanism located between the base component and the supporting platform allows for selective adjustment of the height of the supporting platform and, hence, of the pillow relative to the mattress. The height adjustment structure includes jaw components threadably coupled to an actuating rod. The jaw components are pivotable between closed and open configurations for respectively bringing the platform in an adjacent and in a spaced relationship relative to the base component. An obstructing component is mounted between the supporting platform and base components for obstructing access to the height adjustment structure.