Thermoplastic elastomer composition

A thermoplastic elastomer composition, comprising:

• a component (A) which is 50 to 85 parts by mass of an acrylic rubber prepared by copolymerizing a monomer mixture containing at least one of an alkyl acrylate ester and an alkoxyalkyl acrylate ester, and 0.5 to 15% by mass of an epoxy group-containing monomer;
• a component (B) which is 15 to 50 parts by mass of a thermoplastic polyester resin having a melting point between 160 and 280° C.;
• and
• a component (C) which is 1 to 35 parts by mass of a graft copolymer or a precursor thereof, per the total 100 parts by mass of the components (A) and (B), the graft copolymer or the precursor containing an olefin polymer segment formed from ethylene and a polar monomer and a vinyl copolymer segment formed from an alkyl acrylate ester and at least one vinyl monomer selected from the group consisting of an alkoxy methacrylate, an alkoxy acrylate, an epoxy group-containing monomer, a carboxyl group-containing monomer, a hydroxyl group-containing monomer, an aromatic vinyl monomer, an α-substituted styrene, and a vinyl nitrile, and one of the olefin polymer segment and the vinyl copolymer segment forming a matrix phase and the other forming a dispersed phase in the matrix phase,
• wherein the thermoplastic elastomer composition is obtained by dynamically crosslinking a composition composed of components (A), (B) and (C) with 0.05 to 5 parts by mass of a crosslinking agent per 100 parts by mass of the component (A), and the crosslinking agent is a polycarboxylic acid.