Patent ID: 8691353

Claim:
A polarizing plate, comprising: a first cellulose ester film containing a cellulose ester with a total acyl group substitution degree of 2.8 to 3.0; a second cellulose ester film containing a cellulose ester with a total acyl group substitution degree of 2.0 to 2.6; and a polarizer sandwiched between the first cellulose ester film and the second cellulose ester film, wherein the second cellulose ester film has a retardation value Ro, represented by a formula shown below, of 30 to 200 nm and a retardation value Rt of 70 to 300 nm, and when M1 represents a saponification index in a saponification treatment conducted for the first cellulose ester film and M2 represents a saponification index in a saponification treatment conducted for the second cellulose ester film, M1 and M2 satisfy a conditional formula: M1>M2, wherein M1 is in a range of 90 to 220, M2 is in a range of 5 to 45, and the difference between M1 and M2 is 45 to 175, Ro =( nx−ny )× d Rt ={( nx+ny )/2 −nz}×d where nx is a film in-plane refractive index in a slow axis direction, ny is a film in-plane refractive index in a fast axis direction, nz is a refractive index in a film thickness direction, and d is a thickness (nm) of a film, and the saponification index (M)=a concentration (mol %) of an alkaline solution for saponification×a saponification temperature (×1/10° C.)×a period of time for saponification (×1/10 seconds).