To provide a heat-shrinkable film which shows a strong bonding force over an object to be packaged and superior shrink properties at a low temperature and heat resistance at a high temperature and further, high heat sealing and environmental hygienic properties, without a decrease in the strength due to an ambient temperature.

A first layer consisting of L-LOPE (a copolymer of ethylene and C8α-olefin) with a density of 0.900-0.930 g/cm3 and MFR of 1.0, a second layer of a polybutylene terephthalate resin (intrinsic viscosity: 8.5) and a third layer of polyethylene resin modified by maleic anhydride are laminated over each other as a three-tier form in the layer thickness ratio 2:1:2. Further, this laminate is biaxially stretched at a stretching magnification of 5×5 and thus the heat-shrinkable film with a thickness of 20 μm is obtained.