A liquid crystal aligning agent suitable for use in the production of a liquid crystal display device is provided. The liquid crystal aligning agent comprises at least one polymer selected from a polyamic acid and a soluble polyimide, an aprotic polar solvent and monoethylene glycol dimethyl ether or dipropylene glycol dimethyl ether. The liquid crystal aligning agent has satisfactory printability. Further provided is a liquid crystal alignment layer formed using the aligning agent. The liquid crystal alignment layer is highly uniform.