To provide an adhesive ethylenic copolymer resin composition giving good adhesion to polystyrene resin, ABS resin, polyacrylonitrile resin and ethylene-vinyl acetate copolymer saponified resin even under high temperature conditions, and to provide a laminate using the composition.

The adhesive ethylenic copolymer resin composition comprises, at a specific ratio, [I] a specific long-chain branched ethylene-α-olefin copolymer, or the copolymer and a graft modified product of the copolymer with unsaturated carboxylic acid or its derivative, and [II] a tackifier, and has a specific density, MFR and crystallinity. The laminate has a three-layered structure comprising a resin selected from polystyrene-based polymer, ABS resin and acrylonitrile resin, the above mentioned composition and an ethylene-vinyl acetate copolymer saponified resin in this order, or a four or more-layered structure containing the three-layered structure.