A liquid crystal compound is provided. The liquid crystal compound has stability to heat, light and etc., lower viscosity, suitable optical anisotropy, suitable dielectric anisotropy, excellent compatibility with other liquid crystal compounds, and is in nematic phase in a border range of temperature. A liquid crystal composition including the liquid crystal compound is also provided. Further, a liquid crystal display device including the liquid crystal composition is provided. The liquid crystal compound is shown in formula (a). Ra is, for example, an alkyl group having 1-10 carbon atoms; Rb is, for example, an alkenyl group having 2-10 carbon atoms; La is, for example, a hydrogen atom; and Z1, Z2 and Z3 are, for example, single bonds. A liquid crystal composition includes the liquid crystal compound. The liquid crystal display device includes the liquid crystal composition.
Liquid crystal tetracyclic ring compound having fluorine atom, liquid crystal composition, and liquid crystal display device