Liquid crystal composition and liquid crystal display device

A liquid crystal composition, containing at least one compound selected from the group of compounds represented by formula (1) as a first component, at least one compound selected from the group of compounds represented by formula (2) as a second component and at least one compound selected from the group of compounds represented by formula (3) as a third component:

• wherein R1, R2, R3 and R4 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine;
• R5 and R6 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine, acrylate, methacrylate, vinyloxy, propenylether, oxirane, oxetane or vinylketone, and at least one of R5 and R6 is acrylate, methacrylate, propenylether, oxirane, oxetane or vinylketone;
• ring A is independently 1,4-cyclohexylene or 1,4-phenylene;
• ring B and ring C are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene or 2,5-difluoro-1,4-phenylene;
• ring D and ring E are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene, 2,5-difluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, 2-methyl-1,4-phenylene, 3-methyl-1,4-phenylene or 2,6-naphthalene;
• Z1 is independently a single bond, ethylene, methyleneoxy or carbonyloxy;
• Z2 and Z3 are independently a single bond, alkylene having 1 to 12 carbons, or alkylene having 1 to 12 carbons in which arbitrary —CH2— is replaced by —O—;
• k and j are independently 1, 2 or 3;
• and m is 0, 1 or 2, and
• wherein the at least one compound as the second component comprises arbitrary one of compounds 2-HH-3 and V-HH-3 shown below: