In this study, static deflections of laterally loaded long rectangular sandwich plates were investigated. Symmetrically laminated quasi-isotropic carbon/epoxy plates were used for the face sheets (skins) and balsa wood for the core. Boundary conditions were considered as simply supported and clamped. Maximum deflections were obtained for the parameters such as thicknesses of core material and face sheets, lamination sequences of face sheets and boundary conditions in long plate approximation. Results were compared with those of numerical study based on Finite Element Method and found in good agreement. Maximum deflections of sandwich plates in same weight were investigated too and found larger at the thin core and thick face sheets condition.