A polymerizable compound serially formed of three or four rings not condensed with each other, wherein the polymerizable compound also has three or more polymerizable groups and at least one of the polymerizable groups is bonded with a ring not at both terminals, wherein the polymerizable compound is represented by formula: wherein, in formula, P 1, P 2, P 3 and P 4 are a acryloyloxy, methacryloyloxy, acrylamide, methacrylamide, vinyloxy, vinylcarbonyl, oxiranyl, oxetanyl, 3,4-epoxy-cyclohexyl or maleimide; S 1, S 2, S 3 and S 4 are independently a single bond or alkylene having 1 to 10 carbons, and in the alkylene, at least one of -CH 2 - may be replaced by -O-, -COO-, -OCO- or -OCOO-, at least one of -CH 2 -CH 2 - may be replaced by -CH=CH- or -C≡C-, and at least one of hydrogen may be replaced by fluorine or chlorine; a1, a3, and a4 are independently 0, 1, 2, 3 or 4, a2 is 1, 2, 3 or 4, and a sum of a1, a2, a3 and a4 is 3 to 10; ring A 1 and ring A 4 are independently phenyl, pyrimidyl, pyridyl, naphthyl, cyclohexyl, cyclohexenyl, tetrahydropyranyl or 1,3-dioxanyl, and in the rings, at least one of hydrogen may be replaced by halogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, or alkoxy having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen; ring A 2 and ring A 3 are independently 1,4-phenylene, pyrimidine-2,5-diyl, pyridine-2,5-diyl, 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, 1,4-cyclohexylene, 1,4-cyclohexenylene, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl, and in the rings, at least one of hydrogen may be replaced by halogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, or alkoxy having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen; Z 1, Z 2 and Z 3 are independently a single bond, -CO-, -CH=CH-, -CH=CH-COO-, -OCO-CH=CH-, -C(CH 3)=CH-COO-, -OCO-CH=C(CH 3)-, -CH=C(CH 3)-COO-, -OCO-(CH 3)C=CH-, -C(CH 3)=C(CH 3)-COO-, -OCO-C(CH 3)=C(CH 3)-, -CO-CH=CH-, -CH=CH-CO-, -C(CH 3)=C(CH 3) -, -CH=CH-CH 2 O-, -OCH 2 -CH=CH-, -CH=CH-OCH 2 - or -CH 2 O-CH=CH-; and b1 is 0 or 1. P 1, P 2, P 3 and P 4 are a acryloyloxy, methacryloyloxy, acrylamide, methacrylamide, vinyloxy, vinylcarbonyl, oxiranyl, oxetanyl, 3,4-epoxy-cyclohexyl or maleimide; S 1, S 2, S 3 and S 4 are independently a single bond or alkylene having 1 to 10 carbons, and in the alkylene, at least one of -CH 2 - may be replaced by -O-, -COO-, -OCO- or -OCOO-, at least one of -CH 2 -CH 2 - may be replaced by -CH=CH- or -C≡C-, and at least one of hydrogen may be replaced by fluorine or chlorine; a1, a3, and a4 are independently 0, 1, 2, 3 or 4, a2 is 1, 2, 3 or 4, and a sum of a1, a2, a3 and a4 is 3 to 10; ring A 1 and ring A 4 are independently phenyl, pyrimidyl, pyridyl, naphthyl, cyclohexyl, cyclohexenyl, tetrahydropyranyl or 1,3-dioxanyl, and in the rings, at least one of hydrogen may be replaced by halogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, or alkoxy having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen; ring A 2 and ring A 3 are independently 1,4-phenylene, pyrimidine-2,5-diyl, pyridine-2,5-diyl, 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, 1,4-cyclohexylene, 1,4-cyclohexenylene, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl, and in the rings, at least one of hydrogen may be replaced by halogen, alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkyl having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen, or alkoxy having 1 to 12 carbons in which at least one of hydrogen is replaced by halogen; Z 1, Z 2 and Z 3 are independently a single bond, -CO-, -CH=CH-, -CH=CH-COO-, -OCO-CH=CH-, -C(CH 3)=CH-COO-, -OCO-CH=C(CH 3)-, -CH=C(CH 3)-COO-, -OCO-(CH 3)C=CH-, -C(CH 3)=C(CH 3)-COO-, -OCO-C(CH 3)=C(CH 3)-, -CO-CH=CH-, -CH=CH-CO-, -C(CH 3)=C(CH 3) -, -CH=CH-CH 2 O-, -OCH 2 -CH=CH-, -CH=CH-OCH 2 - or -CH 2 O-CH=CH-; and b1 is 0 or 1.