A liquid crystal display device which includes a liquid crystal composition exhibiting a blue phase and has high reliability is provided. In a manufacturing method of a liquid crystal display device which includes a liquid crystal composition exhibiting a blue phase, the liquid crystal composition including nematic liquid crystal, a chiral agent, a polymerizable monomer, and a photopolymerization initiator which absorbs light with a peak wavelength that is different from a peak wavelength of light absorbed by the nematic liquid crystal is used. The liquid crystal composition is capable of exhibiting a blue phase and is irradiated with light absorbed by the photopolymerization initiator so that the liquid crystal composition is polymerized.