A chassis base assembly includes a chassis base in which a plurality of slots are formed, and a reinforcing member coupled to the chassis base to protrude through the slots from a surface of the chassis base to the opposite side thereof. A plasma display device assembly includes a panel assembly having a plurality of discharge electrodes formed thereon and forming an image during discharge, a chassis base supporting the panel assembly and having a plurality of slots formed herein, a drive circuit portion coupled to a rear side of the chassis base, a flexible printed cable having end portions respectively connected to each of ports of the panel assembly and each of ports of the drive circuit portion, and a reinforcing member disposed between the panel assembly and the chassis base and reinforcing the chassis base.