Thermoplastic elastomer composition and molding

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TPE and TPV excellent in flexibility, compression set and mechanical strength are obtained by using a conjugated diene-based polymer having a sharp molecular weight distribution which is obtained by polymerization using a neodymium-based catalyst. A thermoplastic elastomer composition containing (A) a conjugated diene-based polymer obtained by polymerizing a conjugated diene-based compound using a rare earth element compound-based catalyst and (B) a thermoplastic resin, and a formed article using the same.