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 (3-1) as a third component:

• wherein P1 and P2 are independently a group selected from groups represented by formula (P-1) to formula (P-6);
• R1 and R2 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons;
• R3 is independently ethyl or vinyl;
• R4 is propyl;
• ring A and ring B are independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, tetrahydropyran-2,5-diyl, 1,3-dioxane-2,5-diyl or pyrimidine-2,5-diyl, and in the groups, at least one of hydrogen may be replaced by halogen or alkyl having 1 to 12 carbons, or alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen;
• ring C and ring E are independently 1,4-cyclohexylene, tetrahydropyran-2,5-diyl, 1,4-phenylene, 2-fluoro-1,4-phenylene or 3-fluoro-1,4-phenylene;
• ring D 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;
• Sp is —C═C—O—, —C═C—, —C—C═C—, —O—, —C—C—O—, or —(CO)—O—;
• Z1, Z2, and Z3 are independently a single bond, ethylene, methyleneoxy or carbonyloxy;
• k is 0, 1, 2 or 3;
• m is 1, 2 or 3;
• and n is 0 or 1, and a sum of m and n is 3 or less.