A copolymer of a strait chain .alpha.-olefin and a vinyl compound (I) represented by the general formula CH.sub.2.dbd.CH--R, wherein R is a hydrocarbon group, the steric parameter Es of the substituent R is -1.64 or less and the steric parameter B1 of the substituent R is 1.53 or more, an adhesive containing the same as an effective ingredient, and an laminate containing the adhesive.