A liquid crystal display device having a liquid crystal layer formed by disposing a liquid crystal composition containing a liquid crystal and a polymerizable compound between a pair of substrates provided with electrodes and irradiating and curing the composition with ultraviolet rays by an ultraviolet irradiation apparatus and using an ultraviolet light emitting diode as an ultraviolet light source, and at least one of the substrates being provided with a liquid crystal alignment film to vertically align a liquid crystal, wherein the ultraviolet irradiation apparatus is an ultraviolet irradiation apparatus capable of controlling the irradiation light intensity and wavelength of the ultraviolet rays to be irradiated and the surface temperature of the pair of the substrates, said liquid crystal composition contains a compound represented by the following formula, and said liquid crystal alignment film is a liquid crystal alignment film obtained from a liquid crystal alignment treating agent containing a polymer having a side chain structure represented by the following formula or formula: wherein X 1 is at least one selected from the group consisting of the following formula [1-a] to formula [1-g], X 2 is at least one bond group selected from the group consisting of a single bond, -O-, -NH-, -N(CH 3)-, -CH 2 O-, -CONH-, -NHCO-,-CON(CH 3)-, -N(CH 3)CO-, -COO- and -OCO-, X 3 is a single bond or -(CH 2)a- (a is an integer of from 1 to 15), X 4 is at least one bond group selected from the group consisting of a single bond, -O-, -OCH 2 -, -COO- and -OCO-, X 5 is a benzene ring, a cyclohexane ring or a C 17 - 51 divalent organic group having a steroid skeleton, X 6 is at least one bond group selected from the group consisting of a single bond, -O-,-OCH 2 -, -CH 2 O-, -COO- and -OCO-, X 7 is a benzene ring or a cyclohexane ring, wherein any optional hydrogen atom on the cyclic group of said X 5 or X 7 may be substituted by a C 1-3 alkyl group, a C 1-3 alkoxy group, a C 1-3 fluorinated alkyl group, a C 1-3 fluorinated alkoxy group or a fluorine atom, p is an integer of from 0 to 4, and X 8 is at least one selected from the group consisting of a C 1-18 alkyl group, a C 2-18 alkenyl group, a C 1-18 fluorinated alkyl group, a C 1-18 alkoxy group and a C 1-18 fluorinated alkoxy group, wherein X A is a hydrogen atom or a benzene ring, X B is at least one cyclic group selected from the group consisting of a benzene ring, a cyclohexane ring and a heterocyclic ring, and X C is at least one selected from the group consisting of a C 1-18 alkyl group, a C 1-18 fluorinated alkyl group, a C 1-18 alkoxy group and a C 1-18 fluorinated alkoxy group, wherein Y 1 is at least one bond group selected from the group consisting of a single bond, -(CH 2) a - (a is an integer of from 1 to 15), -O-, -CH 2 O-, -CONH-, -NHCO-,-CON(CH 3)-, -N(CH 3)CO-, -COO- and -OCO-, Y 2 is a single bond or -(CH 2) b - (b is an integer of from 1 to 15), Y 3 is at least one selected from the group consisting of a single bond, -(CH 2) c - (c is an integer of from 1 to 15), -O-, -CH 2 O-, -COO- and-OCO-, Y 4 is at least one divalent cyclic group selected from the group consisting of a benzene ring, a cyclohexane ring and a heterocyclic ring, or a C 17 - 51 divalent organic group having a steroid skeleton, Y 5 is at least one divalent cyclic group selected from the group consisting of a benzene ring, a cyclohexane ring and a heterocyclic ring, wherein any optional hydrogen atom on the cyclic group of said Y 4 or Y 5 may be substituted by a C 1-3 alkyl group, a C 1-3 alkoxy group, a C 1-3 fluorinated alkyl group, a C 1-3 fluorinated alkoxy group or a fluorine atom, n is an integer of from 0 to 4, and Y 6 is at least one selected from the group consisting of a C 1-18 alkyl group, a C 2-18 alkenyl group, a C 1-18 fluorinated alkyl group, a C 1-18 alkoxy group and a C 1-18 fluorinated alkoxy group, -Y 7 -Y 8 wherein Y 7 is at least one bond group selected from the group consisting of a single bond, -O-, -CH 2 O-, -CONH-, -NHCO-, -CON(CH 3)-, -N(CH 3)CO-, -COO- and -OCO-, and Y 8 is a C 8-22 alkyl group or a C 6-18 fluorinated alkyl group.