A liquid crystal display device comprising: a common electrode and a pixel electrode disposed on one of a first substrate and a second substrate; an alignment film on each of the first substrate and the second substrate; and a negative dielectric anisotropy liquid crystal layer disposed between the alignment film of the first and second substrates, wherein the alignment film on at least one of the substrates has a polyimide chain with a molecular weight of 100,000 Da or more, wherein the alignment film having the polyimide chain with the molecular weight of 100,000 Da or more includes a first portion imparted with anisotropy and a second portion without the anisotropy, the first portion being positioned closer to the negative dielectric anisotropy liquid crystal layer than the second portion, wherein the volume resistivity of the first portion is higher than a volume resistivity of the second portion, wherein the alignment film is formed from a solution of a precursor mixture dissolved in an organic solvent, the precursor mixture having a first precursor and a second precursor, and the first precursor having a photo-decomposable group and the second precursor without the photo-decomposable group, wherein the second precursor has a higher weight average molecular weight than a weight average molecular weight of the first precursor and forms the second portion of the alignment film having the polyimide chain with a molecular weight of 100,000 Da or more, wherein the first precursor includes a polyimide having the photo-decomposable group and forms the first portion of the alignment film having the polyimide chain with a molecular weight of 100,000 Da or more, wherein the polyimide is a compound represented by Chemical Formula 1 below: where X represents cyclobutane, Y represents an aromatic hydrocarbon group having 2 or more rings, and n represents a natural number. a common electrode and a pixel electrode disposed on one of a first substrate and a second substrate; an alignment film on each of the first substrate and the second substrate; and a negative dielectric anisotropy liquid crystal layer disposed between the alignment film of the first and second substrates, wherein the alignment film on at least one of the substrates has a polyimide chain with a molecular weight of 100,000 Da or more, wherein the alignment film having the polyimide chain with the molecular weight of 100,000 Da or more includes a first portion imparted with anisotropy and a second portion without the anisotropy, the first portion being positioned closer to the negative dielectric anisotropy liquid crystal layer than the second portion, wherein the volume resistivity of the first portion is higher than a volume resistivity of the second portion, wherein the alignment film is formed from a solution of a precursor mixture dissolved in an organic solvent, the precursor mixture having a first precursor and a second precursor, and the first precursor having a photo-decomposable group and the second precursor without the photo-decomposable group, wherein the second precursor has a higher weight average molecular weight than a weight average molecular weight of the first precursor and forms the second portion of the alignment film having the polyimide chain with a molecular weight of 100,000 Da or more, wherein the first precursor includes a polyimide having the photo-decomposable group and forms the first portion of the alignment film having the polyimide chain with a molecular weight of 100,000 Da or more, wherein the polyimide is a compound represented by Chemical Formula 1 below: where X represents cyclobutane, Y represents an aromatic hydrocarbon group having 2 or more rings, and n represents a natural number.