Technological watch

[Problem] To provide a polyolefin-based biomass shrink film that achieves a reduced environmental load without impairing suitability for printing and has excellent transparency even after heat shrink packaging. [Solution] This polyolefin-based biomass shrink film is configured from five layers of a surface layer, an intermediate layer, a core layer, another intermediate layer, and another surface layer in this order. The two surface layers are formed from a surface layer-forming resin composition that contains prescribed amounts of a propylene-based resin (A), an anti-blocking agent (B), and a slip agent (C), respectively. The two intermediate layers are formed from an intermediate layer-forming resin composition that contains prescribed amounts a propylene-based resin (A), an anti-blocking agent (B), and a slip agent (C), respectively. The core layer is formed from a core layer-forming resin composition that contains prescribed amounts of a propylene-based resin (A), an anti-blocking agent (B), a slip agent (C), and a biomass-derived ethylene-based resin (D), respectively. The degree of biomass is 10% or higher.