Abstract: The present invention relates to a polyethylene resin composition for lamination having excellent adhesiveness to a substrate or the like, and preferably also excellent in easy-opening properties such as easy piercing properties, and more specifically, relates to a polyethylene resin composition (C) for lamination containing an ethylene/propylene copolymer (A) having the following properties (a-1) to (a-4). (a-1) A constituent unit derived from ethylene is contained 80 to 98 mol % as a main component, a constituent unit derived from propylene is contained 2 to 20 mol % as an essential sub-component, and a constituent unit derived from a third ?-olefin other than ethylene and propylene may be contained 5 mol % or less as a sub-component. (a-2) MFR 0.1 to 100 g/10 min. (a-3) Density is 0.88 to 0.94 g/cm3. (a-4) Total of vinyl and vinylidene is 0.35 or more.