Liquid crystal aligning agent, liquid crystal alignment film, method for producing the same, and liquid crystal display device

Disclosed is a liquid crystal aligning agent containing at least one polymer (A) selected from the group consisting of polyamic acids and polyimides, and a compound (B) having a photosensitive group which is crosslinked or isomerized by light having a wavelength of 200-400 nm and an epoxy group. The liquid crystal aligning agent is used for forming a liquid crystal alignment film which is capable of aligning liquid crystals through irradiation of polarized or unpolarized radiation without performing a rubbing process.