A liquid crystal composition having positive dielectric anisotropy and including at least one polymerizable compound selected from the group of compounds represented by formula as a first additive, and at least one polar compound selected from the group of compounds represented by formula and formula as a second additive: MES-R 5 (R 4) g -R 5 in formula, ring A and ring C are independently cyclohexyl, cyclohexenyl, phenyl, 1-naphthyl, 2-naphthyl, tetrahydropyran-2-yl, 1,3-dioxane-2-yl, pyrimidine-2-yl or pyridine-2-yl, and in these rings at least one hydrogen may be replaced by fluorine, chlorine, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkyl having 1 to 12 carbons in which at least one hydrogen has been replaced by fluorine or chlorine; ring B is 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, naphthalene-1,2-diyl, naphthalene-1,3-diyl, naphthalene-1,4-diyl, naphthalene-1,5-diyl, naphthalene-1,6-diyl, naphthalene-1,7-diyl, naphthalene-1,8-diyl, naphthalene-2,3-diyl, naphthalene-2,6-diyl, naphthalene-2,7-diyl, tetrahydropyran-2,5-diyl, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diyl or pyridine-2,5-diyl, and in these rings at least one hydrogen may be replaced by fluorine, chlorine, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkyl having 1 to 12 carbons in which at least one hydrogen has been replaced by fluorine or chlorine; Z 1 and Z 2 are independently a single bond or alkylene having 1 to 10 carbons, and in the alkylene at least one - CH 2 - may be replaced by -O-, -CO-, -COO- or -OCO-, and at least one - CH 2 -CH 2 - may be replaced by -CH=CH-, -C(CH 3)=CH-, -CH=C(CH 3)- or - C(CH 3)=C(CH 3)-, and in these groups at least one hydrogen may be replaced by fluorine or chlorine; P 1, P 2 and P 3 are a polymerizable group; Sp 1, Sp 2 and Sp 3 are independently a single bond or alkylene having 1 to 10 carbons, and in the alkylene at least one -CH 2 - may be replaced by -O-, -COO-, -OCO- or -OCOO-, and at least one -CH 2 -CH 2 - may be replaced by - CH=CH- or -C≡C-, and in these groups at least one hydrogen may be replaced by fluorine or chlorine; a is 0, 1 or 2; and b, c and d are independently 0, 1, 2, 3 or 4, with the proviso that a is 1 or 2 when ring A and ring C are phenyl and that Sp 1 and Sp 3 are a single bond when a is 1; in formula, MES is a mesogenic group having at least one ring; in formula, R 4 is alkyl having 4 to 20 carbons, and in the alkyl at least one -CH 2 - may be replaced by -CH=CH-, -CF=CH-, -CH=CF-, -C≡C- or cycloalkylene having 3 to 8 carbons, and in these groups at least one hydrogen may be replaced by fluorine or chlorine; in formula and formula, R 5 is a polar group containing at least one of an oxygen atom of a OH moiety, a sulfur atom of an SH moiety and a nitrogen atom of primary, secondary or tertiary amine moiety; and g is 1 or 2. in formula, ring A and ring C are independently cyclohexyl, cyclohexenyl, phenyl, 1-naphthyl, 2-naphthyl, tetrahydropyran-2-yl, 1,3-dioxane-2-yl, pyrimidine-2-yl or pyridine-2-yl, and in these rings at least one hydrogen may be replaced by fluorine, chlorine, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkyl having 1 to 12 carbons in which at least one hydrogen has been replaced by fluorine or chlorine; ring B is 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, naphthalene-1,2-diyl, naphthalene-1,3-diyl, naphthalene-1,4-diyl, naphthalene-1,5-diyl, naphthalene-1,6-diyl, naphthalene-1,7-diyl, naphthalene-1,8-diyl, naphthalene-2,3-diyl, naphthalene-2,6-diyl, naphthalene-2,7-diyl, tetrahydropyran-2,5-diyl, 1,3-dioxane-2,5-diyl, pyrimidine-2,5-diyl or pyridine-2,5-diyl, and in these rings at least one hydrogen may be replaced by fluorine, chlorine, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkyl having 1 to 12 carbons in which at least one hydrogen has been replaced by fluorine or chlorine; Z 1 and Z 2 are independently a single bond or alkylene having 1 to 10 carbons, and in the alkylene at least one - CH 2 - may be replaced by -O-, -CO-, -COO- or -OCO-, and at least one - CH 2 -CH 2 - may be replaced by -CH=CH-, -C(CH 3)=CH-, -CH=C(CH 3)- or - C(CH 3)=C(CH 3)-, and in these groups at least one hydrogen may be replaced by fluorine or chlorine; P 1, P 2 and P 3 are a polymerizable group; Sp 1, Sp 2 and Sp 3 are independently a single bond or alkylene having 1 to 10 carbons, and in the alkylene at least one -CH 2 - may be replaced by -O-, -COO-, -OCO- or -OCOO-, and at least one -CH 2 -CH 2 - may be replaced by - CH=CH- or -C≡C-, and in these groups at least one hydrogen may be replaced by fluorine or chlorine; a is 0, 1 or 2; and b, c and d are independently 0, 1, 2, 3 or 4, with the proviso that a is 1 or 2 when ring A and ring C are phenyl and that Sp 1 and Sp 3 are a single bond when a is 1; in formula, MES is a mesogenic group having at least one ring; in formula, R 4 is alkyl having 4 to 20 carbons, and in the alkyl at least one -CH 2 - may be replaced by -CH=CH-, -CF=CH-, -CH=CF-, -C≡C- or cycloalkylene having 3 to 8 carbons, and in these groups at least one hydrogen may be replaced by fluorine or chlorine; in formula and formula, R 5 is a polar group containing at least one of an oxygen atom of a OH moiety, a sulfur atom of an SH moiety and a nitrogen atom of primary, secondary or tertiary amine moiety; and g is 1 or 2.