To provide a liquid crystal compound satisfying at least one physical property such as high stability to light, a high clearing point, low minimum temperature of a liquid crystal phase, small viscosity, suitable optical anisotropy, large dielectric anisotropy, large dielectric constant in a minor-axis direction, suitable elastic constant, excellent compatibility, a liquid crystal composition containing the compound and a liquid crystal display device including the composition. The compound is represented by formula (1):
wherein, for example, R
1 is alkyl having 1 to 15 carbons, rings A
1 to A
4 are 1,4-cyclohexylene or 1,4-phenylene, at least one of Z
1 to Z
5 is —CF
2O—, and X
1 is fluorine or —OCF
3;
- W1 is a group represented by formula (1a) or (1b);
- wherein, Y1 to Y5 are fluorine;
- W2 is a group represented by formula (1c) or (1d);
- wherein, L1 to L5 are fluorine; and a, b, c and d are independently 0 or 1.