An elastic analysis of stress and deformation was attempted for anisotropic rectangular plates of the single-wall corrugated fiberboard (SWCF) supported by four edges under uniform loading. Stresses distirbution for square and rectanglar plates are discussed by this analysis. Results obtained are as follows. The deflection increases monotonically from zero at plate edges to maximum at the center. Support forces of edges increase from zero at those corners to maximum at those centers. The normal stress in the cross direction (CD) on surfaces of the kraftliner (KL) increases monotonically from zero at edges to maximum at the center. The normal stress in the machine direction (MD) on KL surfaces is symmetical at two maximum points along the MD center line of the plate. The shear stress of KL surfaces distributes antisymmetically, and becomes maximum at four coners and becomes zero on center lines of CD and MD.