Disclosed is a multilayer film including a resin layer formed at least on one surface of a biaxially stretched film, the resin layer including an acid-modified polyolefin resin (A), a polyurethane resin (B), a cross-linking agent (C) and an acetylene glycol-based surfactant (D), wherein the cross-linking agent (C) includes a melamine-based cross-linking agent (C1) and/or an oxazoline-based cross-linking agent (C2); the mass ratio ((A)/(B)) between (A) and (B) is 60/40 to 97/3; and the total amount of (C1) and (C2) is 1 to 20 parts by mass, or the amount of (C1) as a single substance and the amount of (C2) as a single substance are each 1 to 20 parts by mass, and the amount of (D) is 5 to 50 parts by mass in relation to 100 parts by mass of the total amount of (A) and (B).