Polyolefin-based resin film and laminate including the same

A polyolefin-based resin film comprising a polyolefin-based resin composition, wherein the polyolefin-based resin composition comprises a propylene-α olefin random copolymer, an ethylene-butene copolymeric elastomer, and a propylene-butene copolymeric elastomer, and the following 1) to 3) are satisfied:

• 1) The polyolefin-based resin composition contains 2 to 9 parts by weight of the ethylene-butene copolymeric elastomer and 2 to 9 parts by weight of the propylene-butene copolymeric elastomer based on 100 parts by weight of the propylene-α olefin random copolymer;
• 2) The polyolefin-based resin film exhibits a thermal shrinkage rate after heating at 120° C. for 30 minutes of 25% or less in a direction in which the thermal shrinkage rate after heating at 120° C. for 30 minutes is larger between a longitudinal direction and a lateral direction of the polyolefin-based resin film;
• and
• 3) A planar orientation coefficient ΔP calculated from a refractive index of the polyolefin-based resin film is 0.0100 or more and 0.0145 or less.