Wall panel attachment apparatus

A wall panel attachment apparatus comprising an interior pillar, a plurality of wall panels, fitting fixture and screws, said pillar including a plate-like portion molded to have a cross section providing at least one flange transverse to said plate, each such panel-receiving flange formed at the edge of said plate-like portion, and a joint-inserting portion projected at a central portion of said panel-receiving flange in the direction of extension of the edge of the plate to a reference edge and having a screw-inserting groove in the reference edge extending in its longitudinal direction, said wall panels each having a groove formed in the side edge thereof and being disposed along said panel-receiving flange, said fitting fixture being fitted into said grooves of adjacent walls panels, said screw applied through the fitting being pressed into said screw-inserting groove to press the fixture against said reference edge and said panels against their respective flanges, whereby a partition wall structure is assembled around said pillar, another pillar with its plate portion transverse to the plate portion of said interior pillar positioned to cover said joint-inserting portion, at least one screw hole in said another pillar, and an extended length screw extending therethrough and into said groove formed in the joint-inserting portion, whereby another pillar is connected to said pillar and against said panels.