To obtain a resin composition for forming a film having excellent balance of physical properties such as mechanical strengths, heat resistance, blocking resistance, slipperiness, transparency, etc., and slight discoloration with time.

This resin composition is obtained by compounding 100 pts.wt. of a copolymer (I) of ethylene and a 3-18C α-olefin having 0.890-0.940 g/cm3 density and 0.3-20 g/10 minutes melt flow rate with 1-50 pts.wt. of a low-density polyethylene (II) produced by a high-pressure radical polymerization method, 0.01-0.15 pt.wt. of a phenol-based heat stabilizer (IIIa), 0.005-0.3 pt.wt. of the total of a phosphorus-based heat stabilizer (IIIb) and 3-phenylbenzofuran-2-one (IIIc), 0.05-1.0 pt.wt. of an antiblocking agent (IV) and 0.02-1.0 pt.wt. of a fatty acid amide.