The invention provides a liquid crystal compound represented by formula (1): wherein, in formula (I), for example, R1 is fluorine, chlorine, or alkyl having 1 to 10 carbons, and in the alkyl, at least one of —CH2— may be replaced by —O—, —S—, —CO— or —SiH2—, and at least one of —(CH2)2— may be replaced by —CH═CH— or —C≡C—. The compound has a low threshold voltage and excellent compatibility with other liquid crystal compounds, and further excellent general physical properties required for the compound. The invention also provides a liquid crystal composition containing at least one of the compounds and having excellent properties, and a liquid crystal display device including the composition, and having a wide usable temperature range, a short response time, a large contrast ratio and a low driving voltage, and therefore can be used for a liquid crystal projector and a liquid crystal television.