Liquid crystal display panel and liquid crystal display device

A liquid crystal display panel comprising, sequentially from an observation surface side toward a back surface side,

• a first polarizing plate;
• a first retardation provision portion;
• a first substrate;
• a second retardation provision portion;
• a liquid crystal layer containing nematic liquid crystal;
• a second substrate;
• and
• a second polarizing plate,
• wherein one of the first substrate and the second substrate includes a pair of electrodes configured to generate a horizontal electric field at the liquid crystal layer upon voltage application,
• the nematic liquid crystal homogeneously aligns with no voltage application between the electrodes,
• the first retardation provision portion includes a first λ/4 plate having principal refractive indexes satisfying the relation of nx>ny≥nz,
• the second retardation provision portion includes a second λ/4 plate having principal refractive indexes satisfying the relation of nx>ny≥nz,
• one of the first retardation provision portion and the second retardation provision portion includes, on the first substrate side, a first retarder having principal refractive indexes satisfying the relation of nx≤ny<nz, and
• the in-plane slow axis of the first λ/4 plate forms an angle of 45° with the absorption axis of the first polarizing plate and is orthogonal to the in-plane slow axis of the second λ/4 plate.