A liquid crystal display device having a liquid crystal layer made of a cured product formed by irradiating a liquid crystal composition disposed between a pair of substrates provided with electrodes with ultraviolet light from an ultraviolet irradiation apparatus and at least one of the substrates being provided with a liquid crystal alignment film to vertically align liquid crystal, wherein the liquid crystal composition comprises a curable resin, a bifunctional monomer, a compound of the following formula, a compound of the following formula and a monomer having at least one polar group selected from the group consisting of a hydroxy group, a carboxy group and a phosphoric acid group, and the liquid crystal alignment film is a liquid crystal alignment film obtainable from a liquid crystal alignment treating agent containing a polymer having a side chain structure of the following formula or formula, wherein T 1 is a structure selected from the following formula [1-a] to formula [1-e], T 2 is a single bond or a C 1-24 alkylene group, provided that an optional -CH 2 - in said alkylene group may be substituted by -O-, -CO-, -COO-, -OCO-, -CONH-, -NHCO-, -NH-, -CON(CH 3)-, -S- or -SO 2 -, T 3 is a cyclic group having a benzene ring, a cyclohexane ring or a heterocyclic ring, or a C 17-51 bivalent organic group having a steroid skeleton, provided that an optional hydrogen atom on said cyclic group may be substituted by a C1-3 alkyl group, a C 1-3 alkoxy group, a C 1-3 fluorine-containing alkyl group, a C 1-3 fluorine-containing alkoxy group or a fluorine atom, T 4 is a single bond, -O-, -OCH 2 -, -CH 2 O-, -COO- or -OCO-, T 5 is a cyclic group having a benzene ring, a cyclohexane ring or a heterocyclic ring, provided that an optional hydrogen atom on such a cyclic group may be substituted by a C 1-3 alkyl group, a C 1-3 alkoxy group, a C 1-3 fluorine-containing alkyl group, a C 1-3 fluorine-containing alkoxy group or a fluorine atom, T 6 is a C1-18 alkyl group, a C 2-18 alkenyl group, a C 1-18 fluorine-containing alkyl group, a C 1-18 alkoxy group or a C 1-18 fluorine-containing alkoxy group, and nT is an integer of from 0 to 4, wherein T A is a C 1-5 alkyl group, wherein S 1 is at least one member selected from the group consisting of the following formula [2-a] to formula [2-e], S 2 is a C 2-18 linear or branched alkylene group, provided that an optional -CH 2 - in said alkylene group not adjacent to S 1 and -N=C=O may be substituted by -O-, -CO-, -COO-, -OCO-, -CONH-, - NHCO- or -NH-, and nS is an integer of from 1 to 4, wherein S A and S C are each a single bond, -O-, -CH 2 O-, -COO-, -OCO-, -CONH-, -NHCO- or -NH-, and S B is a hydrogen atom or a benzene ring, wherein X 1 and X 3 are each a single bond, -(CH 2) a - (a is an integer of from 1 to 15), -O-, -CH 2 O-, -COO- or -OCO-, X 2 is a single bond or -(CH 2) b - (b is an integer of from 1 to 15), X 4 is a cyclic group having a benzene ring, a cyclohexane ring or a heterocyclic ring, or a C 17-51 bivalent organic group having a steroid skeleton, provided that an optional hydrogen atom on said cyclic group may be substituted by a C 1-3 alkyl group, a C 1-3 alkoxy group, a C 1-3 fluorine-containing alkyl group, a C 1-3 fluorine-containing alkoxy group or a fluorine atom, X 5 is a cyclic group having a benzene ring, a cyclohexane ring or a heterocyclic ring, provided that an optional hydrogen atom on such a cyclic group, may be substituted by a C 1-3 alkyl group, a C 1-3 alkoxy group, a C 1-3 fluorine-containing alkyl group, a C 1-3 fluorine-containing alkoxy group or a fluorine atom, X 6 is a C 1-18 alkyl group, a C 2-18 alkenyl group, a C 1-18 fluorine-containing alkyl group, a C 1-18 fluorine-containing alkoxy group or a C 1-18 fluorine-containing alkoxy group, and n is an integer of from 0 to 4, -X 7 -X 8 wherein X 7 is a single bond, -O-, -CH 2 O-, -CONH-, -NHCO-, -CON(CH 3)-, -N(CH 3)CO-, -COO- or -OCO-, and X 8 is a C 8-18 alkyl group or a C 6-18 fluorine-containing alkyl group.