Liquid crystal composition and liquid crystal display device

A liquid crystal composition that has a negative dielectric anisotropy and a ratio of rotational viscosity (γ1) to an elastic constant (K33) in a range of 4.2 GPa·s/N or less, and contains a compound represented by formula (1-1) as a first component, and at least one compound represented by formula (2) as a second component, wherein a ratio of the first component is in a range of 15 wt % to 90 wt % based on a total weight of the liquid crystal composition:

• wherein R1 is propyl;
• R3 and R4 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons, alkenyloxy having 2 to 12 carbons, alkyl having 1 to 12 carbons in which at least one hydrogen is replaced by fluorine, or alkenyl having 2 to 12 carbons in which at least one hydrogen is replaced by fluorine;
• ring A and ring C are independently 1,4-cyclohexylene, 1,4-phenylene, 1,4-phenylene in which at least one hydrogen is replaced by fluorine or chlorine, or tetrahydropyran-2,5-diyl;
• ring B is 2,3-difluoro-1,4-phenylene, 2-chloro-3-fluoro-1,4-phenylene, 2,3-difluoro-5-methyl-1,4-phenylene, 3,4,5-trifluoronaphthalene-2,6-diyl or 7,8-difluorochroman-2,6-diyl;
• Z1 and Z2 are independently a single bond, ethylene, methyleneoxy or carbonyloxy;
• m is 1, 2 or 3;
• and
• n is 0 or 1, and a sum of m and n is 3 or less,
• and wherein at least one compound in the second component is represented by formula (2-4-1):
• wherein R8 is straight-chain alkyl having 1 to 12 carbons or straight-chain alkenyl having 2 to 12 carbons, and R10 is straight-chain alkyl having 1 to 12 carbons or straight-chain alkoxy having 1 to 12 carbons.