Polarizing plate

A polarizing plate, comprising:

• a polarizer;
• and
• a protective film arranged on at least one side of the polarizer,
• wherein the polarizing plate has been subjected to a heat treatment under conditions of a temperature in a range of from 85° C. to 120° C. and a time period of 1 hour or more and 100 hours or less,
• wherein the polarizing plate has a dimensional change ratio of −0.2% or more in a transmission axis direction thereof;
• wherein the dimensional change ratio is measured by cutting the polarizing plate to 100 mm by 100 mm while bonded to a glass plate with a pressure-sensitive adhesive and an operation wherein the polarizing plate bonded to the glass plate is left to stand under an atmosphere at −40° C. for 30 minutes and then left to stand under an atmosphere at 85° C. for 30 minutes, is repeated 100 times, and
• the polarizing plate has one selected from the group consisting of a through-hole formed therein, a site having an outer edge forming a substantially V-shape that is convex inward in a surface direction, and the combination of the through-hole and the site.

A polarizing plate, comprising:

• a polarizer;
• and
• a protective film arranged on at least one side of the polarizer,
• wherein the polarizing plate has a thickness of 20 μm or less,
• wherein the polarizing plate has been subjected to heat treatment under conditions of a temperature in a range from 85° C. to 120° C. and a time period of 1 hour or more and 100 hours or less,
• wherein the polarizing plate has a dimensional change ratio of −0.2% or more in a transmission axis direction thereof;
• wherein the dimensional change ratio is measured by cutting the polarizing plate to 100 mm by 100 mm while bonded to a glass plate with a pressure-sensitive adhesive and an operation wherein the polarizing plate bonded to the glass plate is left to stand under an atmosphere at −40° C. for 30 minutes and then left to stand under an atmosphere for 85° C. for 30 minutes, is repeated 100 times, and
• the polarizing plate has one selected from the group consisting of a through-hole formed therein, a site having an outer edge forming a substantially V-shape that is convex inward in a surface direction, and a combination of the through-hole and the site.