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

A method for manufacturing a liquid crystal display device including a liquid crystal layer containing liquid crystal compounds aligned in a predetermined direction with no voltage applied, the method 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 containing at least one selected from a polyamic acid structure and a polyimide structure in its main chain;
• forming a liquid crystal layer by sealing, between the substrates on at least one of which the alignment film is formed, a liquid crystal composition containing a liquid crystal material and at least one monomer including at least one monomer represented by the following formula (1);
• and
• forming a polymer layer from a second polymer between the alignment film and the liquid crystal layer by irradiating the liquid crystal layer with ultraviolet light, the second polymer being obtained by polymerizing the at least one monomer including at least one monomer represented by the following formula (1),
• the forming a polymer layer including covalently bonding the second polymer to the first 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.