Liquid crystal orientating agent and liquid crystal display element using it

A liquid crystal aligning agent comprising a polyimide precursor having a structural unit represented by the formula (1) and having a volume resistivity of from 1×101 to 1×1014 Ωcm when formed into a film, and a polyimide precursor having a structural unit represented by the formula (2-1) or a polyimide having a structural unit represented by the formula (2-2):

• in the formula (1), R represents a hydrogen atom or an alkyl group, X represents a tetravalent organic group, and A represents a bivalent organic group,
• in the formulae (2-1) and (2-2), R represents a hydrogen atom or an alkyl group, Y represents a tetravalent organic group, B represents a bivalent organic group, and from 10 to 100 mol % of B is a bivalent organic group having any one of the following structures (3) to (5) in its structure, or a paraphenylene group:
• in the formula (3), ml is an integer of from 2 to 18,
• in the formula (4), one or a plurality of optional hydrogen atoms on the benzene rings may be substituted by a monovalent organic group other than a primary amino group, and m2 is an integer of from 1 to 8,
• in the formula (5), one or a plurality of optional hydrogen atoms on the benzene rings may be substituted by a monovalent organic group other than a primary amino group, and m3 is an integer of from 1 to 4.