To provide a sheet polarizer, preventing deterioration and dimensional change of a polarizer due to drain shortage in a drying process for a polarizer, and having high durability, visibility and productivity, and provide a liquid crystal display device using the sheet polarizer.

This sheet polarizer includes at least a polyester film, a polarizer and a cellulose ester film as components, wherein the total substitution degree of the cellulose ester film ranges from 2.0-2.5, and the humidity change (relative humidity 80-20% RH) of equilibrium moisture content at temperature of 23°C ranges from 3.0-5.0%.