Abstract: A partition system formed of a plurality of partition panel units held in erect position by an upper securing member and a lower securing member. The lower securing member is fixed to the floor and has a mounting surface in face-to-face relationship with the panel units. The system permits easy erecting of panel units from one side of the wall by slipping the top of each unit into the upper securing member, pivoting the unit into each face-to-face relationship with the mounting surface, adjusting the unit vertically and anchoring the unit in position. An open passage is formed beneath the panel units in the partition structure. This passage easily accommodates various services, such as wiring, and after such services are inserted, it is closed by means of a supporting plate which supports the side of the panel units remote from the mounting surface.