Liquid crystal display device and method for manufacturing liquid crystal display device

A method for manufacturing a liquid crystal display device, comprising:

• preparing a pair of substrates;
• forming an alignment film by applying to a surface of at least one of the substrates an alignment agent that contains a first polymer, having in its main chain at least one selected from a polyamic acid structure and a polyimide structure or a polysiloxane structure, and at least one monomer including at least one monomer represented by the following formula (1);
• and
• polymerizing, after the forming an alignment film, the at least one monomer including at least one monomer represented by the following formula (1) so as to form a second polymer,
• wherein P1 and P2 are the same as or different from each other, and each represent an acryloyloxy, methacryloyloxy, acryloylamino, methacryloylamino, vinyl, or vinyloxy group,
• Sp1 and Sp2 are the same as or different from each other, and each represent a C1-C10 linear, branched, or cyclic alkylene or alkenylene group, or a direct bond,
• L1 and L2 are the same as or different from each other, and each represent a —NH— group, a —N(CH3)— group, a —O— group, a —S— group, or a direct bond, and
• at least one hydrogen atom in each phenylene group is optionally replaced.