A high-brightness polarizing plate of the present invention comprises a
polarizing plate that comprises a polarizer and a protective film
prepared on one or both sides of the polarizer, a brightness enhancement
film and an adhesive layer through which the polarizing plate and the
brightness enhancement film are laminated with the protective film
interposed between them, wherein the protective film has an in-plane
retardation Re of 0 to 10 nm and a thickness-direction retardation Rth of
-30 to 10 nm, wherein Re=(nx-ny)d and Rth={(nx+ny)/(2-nz)}d. The
high-brightness polarizing plate has a small color shift, and can be
applied to various image displays such as liquid crystal displays.