LAMINATED POROUS FILM, SEPARATOR FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

Disclosed is a laminated porous film that simultaneously satisfies communication, heat resistance and workability and has excellent properties as a separator for non-aqueous electrolyte secondary batteries. The laminated porous film is characterized in that a heat-resistant layer comprising a filler (a), a resin binder(b), and an extending agent(c)is laminated on at least one side of a porous polyolefin resin film, and in that the air permeability is no more than 2,000s/100ml.