Polarizing plate, polarizing plate manufacturing method, and optical apparatus

A method of manufacturing a polarizing plate with a wire grid structure, comprising:

• a grid-shaped convex portion forming step of forming a grid-shaped convex portion extending in a predetermined direction at a pitch shorter than a wavelength of light of a use band at one surface side of a transparent substrate larger than a use size of the polarizing plate;
• a water-repellent layer forming step of forming a water-repellent layer covering a surface of the transparent substrate and a surface of the grid-shaped convex portion at one surface side of the transparent substrate;
• and
• a cutting step of cutting the transparent substrate provided with the water-repellent layer into the use size.

A method of manufacturing a polarizing plate with a wire grid structure, comprising:

• a grid-shaped convex portion forming step of forming a grid-shaped convex portion extending in a predetermined direction at a pitch shorter than a wavelength of light of a use band at one surface side of a transparent substrate equal to a use size of the polarizing plate;
• a water-repellent layer forming step of forming a water-repellent layer covering a surface of the transparent substrate and a surface of the grid-shaped convex portion at one surface side of the transparent substrate;
• and
• a removing step of removing the water-repellent layer formed on a side surface of the transparent substrate by etching.