Polyamide-based resin film

The purpose of the present invention is to provide a biaxially oriented polyamide-based resin film which exhibits excellent laminate strength, soaked laminate strength after hot water treatment, pinhole resistance, impact resistance, and transparency, and which maintains an excellent external appearance even if subjected to sterilization treatment in hot water. Accordingly, provided is a biaxially oriented polyamide-based resin film in which adhesive modified layers respectively including copolymerized polyester on at least one surface thereof are stacked, said biaxially oriented polyamide-based resin film including a polyamide resin and 1-5 mass% of a polyamide-based block copolymer. In the polyamide-based block copolymer: hard components comprise C4-10 cyclic lactam; soft components comprise polyoxypropylene glycol or polyoxytetramethylene glycol which each have a number average molecular weight in the range 500-3000; and the hard-component content (X), the soft-component content (Y), and the number average molecular weight (Mn) are set so as to satisfy formula (1), namely X+Y=100 (parts by mass), and formula (2), namely 478.74*Mn-0.2989