Abstract: A thermoplastic elastomer composition of excellent fusion bond property, which is useful to produce a composite molded product having a molded part that is made of a synthetic resin material, for example, an engineering plastic material, which has excellent mechanical strength, and a molded part that is made of a high-elasticity thermoplastic elastomer. The thermoplastic elastomer composition comprises 100 parts by weight of a thermoplastic elastomer and 25 to 185 parts by weight of a thermoplastic polyester elastomer.

Abstract: A process for producing a composite molded product by fusion-bonding a thermoplastic elastomer composition to a molded piece which has previously been formed from a synthetic resin material and which has a higher hardness (JIS Shore hardness: A scale) than that of a molded piece formed from the thermoplastic elastomer composition, or by fusion-bonding a synthetic resin material to a molded piece which has previously been formed from a thermoplastic elastomer composition and which has a lower hardness than that of a molded piece formed from the synthetic resin material. The thermoplastic elastomer composition comprises 100 parts by weight of a thermoplastic elastomer and 25 to 185 parts by weight of a polyether block amide.