Extruded thermoplastic elastomer foam sheet

The purpose of the present invention is to provide an extruded thermoplastic elastomer foam sheet which has lightweight and excellent impact absorbing properties and can be used suitably as, for example, a protector or protective mat for body protection purposes or the like which is used for reducing bruise, bone fracture or the like in the fields of sports, medicine, nursing care and the like. The extruded thermoplastic elastomer foam sheet according to the present invention is characterized by being produced by the extrusion expansion of a foamable composition comprising (A) a thermoplastic elastomer that is a block copolymer composed of a polymer block containing isobutyrene as a constituent monomer and a polymer block containing an aromatic vinyl monomer as a constituent monomer and (B) thermally expansive microcapsules.