Optically active compound having polymerizable group and its polymer

An optically active compound having a polymerizable group represented by formula (1) or (2):

• P1-Q1-(A1-Z1)m—X1—(Z1-A1)m-Q1-P2 (1)
• P1-Q1-(A1-Z1)m—X2 (2)
• in formulas (1) and (2),
• the ring A1 is independently 1,4-cyclohexylene, 1,4-phenylene, pyridine-2,5-diyl, pyrimidine-2,5-diyl, naphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl or fluorene-2,7-diyl, and in these rings, one or nonadjacent two —CH2— may be replaced by —O—, and in the 1,4-phenylene and fluorene-2,7-diyl, arbitrary hydrogen may be replaced by fluorine, chlorine, cyano, methyl, ethyl, methoxy, hydroxy, formyl, acetoxy, acetyl, trifluoroacetyl, difluoromethyl or trifluoromethyl;
• Z1 is independently a single bond, —O—, —COO—, —OCO—, —CH═CH—COO—, —OCO—CH═CH—, —OCO—(CH2)2—, —(CH2)2—COO—, —O(CH2)2O—, —C≡C—COO—, —OCO—C≡C—, —CH2O—, —OCH2—, —CF2O—, —OCF2—, —(CH2)4—, —(CH2)2—, —(CF2)2—, —CH═CH—, —CF═CF— or —C≡C—;
• m is independently an integer from 1 to 5, and when m is 2 or more, each of a plurality of Z1 may be different groups or at least two of a plurality of Z1 may be the same group, and each of a plurality of the ring A1 may be different rings or at least two of a plurality of the ring A1 may be the same ring;
• Q1 is independently alkylene having 1 to 20 carbons, and in the alkylene, arbitrary hydrogen may be replaced by fluorine or chlorine and arbitrary —CH2— may be replaced by —O—, —COO—, —OCO—, —CH═CH— or —C≡C—;
• X1 is a divalent group having chirality represented by any one of formulas (3-1) to (3-7), and when X1 is formula (3-5) and m is 2 to 4, Z1 is not —OCO—(CH2)2—, —(CH2)2—COO— or —O(CH2)2O— and when X1 is formula (3-5) and m is 1, Q1 is alkylene having 1 to 20 carbons where the group next to the ring A1 in the alkylene is not —(CH2)2—COO—, —OCO—(CH2)2—, —O(CH2)2O—, —O(CH2)3— or —(CH2)3O—;
• X2 is a monovalent group having chirality represented by any one of formulas (3-8) to (3-10);
• P1 is independently a polymerizable group represented by formula (4-1) or (4-2);
• P2 is a polymerizable group represented by any one of formulas (4-1) to (4-5):
• in formulas (4-1) to (4-5), Ra is independently hydrogen, halogen or alkyl having 1 to 5 carbons.