To provide a multilayer coextrusion film which can be used for paper and a paper container with the surface of a polyethylene based container or paper coated with a polyethylene resin and a lid material or a top material of a polyethylene wrapping material such as sterilization paper, has heat seal strength to be easily openable by hand, and is excellent in peeling appearance.

The multilayer coextrusion film comprises laminating a sealing resin layer (A) containing low density polyethylene (a1) and a polybutene-1 resin (a2), a resin layer (B) containing linear low density polyethylene (b1) and a polybutene-1 resin (b2), and a resin layer (C) made of medium density polyethylene (c1) in the order of (A)/(B)/(C). The melting point of the linear low density polyethylene (b1) is lower than that of the low density polyethylene (a1), and the thickness ratio of the combined thickness of the sealing resin layer (A) and the resin layer (B) to the thickness of the entire multilayer coextrusion film is 40-70%.