The present invention provides a vertical alignment mode liquid crystal alignment agent having outstanding vertical alignment and image sticking resistance. The vertical alignment mode liquid crystal alignment agent includes polyamic acid or imidizaition compound which possesses the structure resulting from a tetracarboxylic acid dianhydride with aromatic ketone structure such as benzophenone tetracarboxylic acid and a phenylene diamine with steroid structure, fluorine atom or straight chain alkyl group of C1-22 as substitute.
Vertical alignment mode liquid crystal alignment agent and vertical alignment mode liquid crystal display device