A multi-component ionomer, wherein, in a multi-component copolymer comprising, as essential constitutional units, a structural unit derived from at least one selected from the group consisting of ethylene and an α-olefin containing 3 to 20 carbon atoms, a structural unit derived from a monomer containing at least one selected from the group consisting of a carboxy group and a dicarboxylic anhydride group, and a structural unit derived from an acyclic monomer represented by the following general formula, at least a part of at least one selected from the group consisting of a carboxy group and a dicarboxylic anhydride group of the structural unit is converted into a metal-containing carboxylate containing at least one metal ion selected from the group consisting of Groups 1, 2 and 12 of the periodic table, and wherein a phase angle δ at which an absolute value G* of a complex modulus measured with a rotational rheometer is 0.1 MPa (G* = 0.1 MPa) is from 50 degrees to 75 degrees: where T 1 to T 3 are each independently a hydrogen atom, a hydrocarbon group containing 1 to 20 carbon atoms, a hydrocarbon group containing 1 to 20 carbon atoms and being substituted with a hydroxyl group, a hydrocarbon group containing 2 to 20 carbon atoms and being substituted with an alkoxy group containing 1 to 20 carbon atoms, a hydrocarbon group containing 3 to 20 carbon atoms and being substituted with an ester group containing 2 to 20 carbon atoms, a hydrocarbon group containing 1 to 20 carbon atoms and being substituted with a halogen atom, an alkoxy group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an ester group containing 2 to 20 carbon atoms, a silyl group containing 3 to 20 carbon atoms, a halogen atom or a cyano group, and T 4 is a hydrocarbon group containing 1 to 20 carbon atoms and being substituted with a hydroxyl group, a hydrocarbon group containing 2 to 20 carbon atoms and being substituted with an alkoxy group containing 1 to 20 carbon atoms, a hydrocarbon group containing 3 to 20 carbon atoms and being substituted with an ester group containing 2 to 20 carbon atoms, a hydrocarbon group containing 1 to 20 carbon atoms and being substituted with a halogen atom, an alkoxy group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an ester group containing 2 to 20 carbon atoms, a silyl group containing 3 to 20 carbon atoms, a halogen atom, or a cyano group. wherein, in a multi-component copolymer comprising, as essential constitutional units, a structural unit derived from at least one selected from the group consisting of ethylene and an α-olefin containing 3 to 20 carbon atoms, a structural unit derived from a monomer containing at least one selected from the group consisting of a carboxy group and a dicarboxylic anhydride group, and a structural unit derived from an acyclic monomer represented by the following general formula, at least a part of at least one selected from the group consisting of a carboxy group and a dicarboxylic anhydride group of the structural unit is converted into a metal-containing carboxylate containing at least one metal ion selected from the group consisting of Groups 1, 2 and 12 of the periodic table, and wherein a phase angle δ at which an absolute value G* of a complex modulus measured with a rotational rheometer is 0.1 MPa (G* = 0.1 MPa) is from 50 degrees to 75 degrees: where T 1 to T 3 are each independently a hydrogen atom, a hydrocarbon group containing 1 to 20 carbon atoms, a hydrocarbon group containing 1 to 20 carbon atoms and being substituted with a hydroxyl group, a hydrocarbon group containing 2 to 20 carbon atoms and being substituted with an alkoxy group containing 1 to 20 carbon atoms, a hydrocarbon group containing 3 to 20 carbon atoms and being substituted with an ester group containing 2 to 20 carbon atoms, a hydrocarbon group containing 1 to 20 carbon atoms and being substituted with a halogen atom, an alkoxy group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an ester group containing 2 to 20 carbon atoms, a silyl group containing 3 to 20 carbon atoms, a halogen atom or a cyano group, and T 4 is a hydrocarbon group containing 1 to 20 carbon atoms and being substituted with a hydroxyl group, a hydrocarbon group containing 2 to 20 carbon atoms and being substituted with an alkoxy group containing 1 to 20 carbon atoms, a hydrocarbon group containing 3 to 20 carbon atoms and being substituted with an ester group containing 2 to 20 carbon atoms, a hydrocarbon group containing 1 to 20 carbon atoms and being substituted with a halogen atom, an alkoxy group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an ester group containing 2 to 20 carbon atoms, a silyl group containing 3 to 20 carbon atoms, a halogen atom, or a cyano group.