Liquid crystal aligning agent, a liquid crystal alignment film and a liquid crystal display device

In addition to the initial characteristics for a long time, even when exposed to irradiation of light, the liquid crystal aligning agent which can be alleviated charge suppressing a decrease in voltage holding ratio, and further accumulates the DC voltage obtaining fast liquid crystal alignment film I will provide a. Liquid crystal alignment treating agent containing the following components (A) and component (B). Component (A): it has a nitrogen-containing aromatic heterocyclic hydroxyl group or an alkoxyl group having 1 to 3 carbon atoms in the molecule, and aliphatic said hydroxyl group or alkoxyl group having 1 to 3 carbon atoms hydrocarbon group or aromatic cyclic compound bound to a hydrocarbon group. Component (B): at least one polymer selected from the group consisting of polyimide precursor and the polyimide precursor from the imidized polyimide.