A heat-shrinkable resin film which has heat shrinkage in the maximum shrinkage direction of 20% or higher when a 10 cm.times.10 cm square sample cut out thereof is immersed in hot water at 85.degree. C. for 10 seconds, pulled out, subsequently immersed in water at 25.degree. C. for 10 seconds, and then pulled out, characterized in that a content of nitrogen atoms in a surface of the film is 0.1% to 3.0% and the surface of the film has wet tension of 36 mN/m or higher; and a film roll obtained by winding up the heat-shrinkable resin film characterized in that when the rolled film is sampled at a first sampling part located up to 2 m apart from the end of the rolled film and at other sampling parts located after the first sampling part at intervals of about 100 m and an average content of nitrogen atoms of each sample is calculated, then the content of nitrogen atoms of each sample is within the .+-.0.8% range based on the above average content of nitrogen atoms.