Inorganic polarizing plate and production method thereof

An inorganic polarizing plate, comprising:

• a substrate, which is transparent to light of a bandwidth for use;
• a wire grid layer containing a plurality of metal wires aligned on the substrate with gaps shorter than a wavelength of the light, and
• a metal oxide layer provided between the wire grid layer and the substrate,
• wherein the inorganic polarizing plate satisfies the following formulae (1) to (3):
• 0 nm<(DR−DL) Formula (1)
• 0 nm<|GR−GL| Formula (2)
• 0.90≤SR/SL≤1.30 Formula (3)
• where DL is a distance along a thickness direction of the substrate in a region RL between one metal wire W and a metal wire WL provided next to the metal wire W in the wire grid layer, and DR is a distance along the thickness direction of the substrate in a region RR between the metal wire W and a metal wire WR provided next to the metal wire W and at an opposite side to a side where the metal wire WL is provided, where the region RL is a region between the metal wire W and the metal wire WL provided next to the metal wire W in the wire grid layer, and the region RR is a region between the metal wire W and the metal wire WR provided next to the metal wire W in the wire grid layer,
• where GL is a gap between the metal wire W and the metal wire WL, and GR is a gap between the metal wire W and the metal wire WR, and
• where SL is a ratio of the distance DL to the gap GL, and SR is a ratio of the distance DR to the gap GR;
• and
• wherein Formula (1) is based on a difference between a thickness of the metal oxide layer between the region RR and the substrate, and a thickness of the metal oxide layer between the region RL and the substrate.