The present invention relates to a polymer suitable for use in a liquid crystal aligning agent having excellent liquid crystal alignment, durability and electrical properties, and having excellent shielding power through high density, to a liquid crystal aligning agent composition comprising the same, to a liquid crystal aligning film formed from the liquid crystal aligning agent composition, and to a liquid crystal display device comprising the liquid crystal aligning film. The polymer for a liquid crystal aligning agent comprises at least one repeating unit selected from the group consisting of a repeating unit represented by chemical formula 1, a repeating unit represented by chemical formula 2 and a repeating unit represented by chemical formula 3.;COPYRIGHT KIPO 2020
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