An object of the present invention is to provide a thermoplastic elastomer resin composition and a connector, which can be processed by mold forming and are excellent in the recycling property. The present invention provides a thermoplastic elastomer resin composition including 100 parts by weight of a base resin containing from 60 to 80 wt % of an acid-modified styrene-based elastomer and from 40 to 20 wt % of a syndiotactic polystyrene, and from 0 to 20 parts by weight of a hydrogenated dicyclopentadiene; and a connector using the composition.