NOVELTY - A multilayered microporous polyolefin film has a primary microporous layer containing polypropylene, shutdown temperature of 132 degrees C or less, and electrolyte injection performance of 20 seconds or less. At least one surface layer of the multilayered microporous polyolefin film is primary microporous layer. The polypropylene distribution in the primary microporous layer is uniform in in-plane direction.    USE - Multilayered microporous polyolefin film. Uses include but are not limited to lithium-ion battery cell separator, capacitor, diaphragm for electrolytic capacitor, filter, moisture-permeable waterproof cloth, reverse osmosis membrane filer, fuel cell, humidification film, ultra-filtration membrane, microfiltration membrane, etc.    ADVANTAGE - The multilayered microporous polyolefin film has excellent oxidation resistance, electrolyte injection performance, shutdown characteristics, permeability and strength, and provides safe and reliable battery having excellent durability.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of multilayered microporous polyolefin film, which involves melt-kneading polyolefin resin (p1) having terminal vinyl group concentration of less than 0.2 per 10000 carbon atoms measured by infrared spectroscopy, and film-forming solvent, preparing polyolefin solution (s1), melt-kneading polyolefin resin (p2) having terminal vinyl group concentration of 0.2 or more per 10000 carbon atoms measured by infrared spectroscopy, and film-forming solvent, preparing polyolefin solution (s2), mixing obtained polyolefin solutions (s1) and (s2), extruding the resultant solution, forming a molded product with a shear rate of 60/second or more, cooling the obtained molded product with cooling rate of 30 degrees C/second or more, forming gel-like sheet, stretching the obtained gel-like sheet in one or more directions, creating drawn material, and removing film-forming solvent from the obtained drawn material. The polyolefin resin (p1) includes polyethylene having weight average molecular weight of less than 1x 106, and polypropylene having weight average molecular weight of more than 6x 104 and less than 3x 105. The polyolefin resin (p2) includes polyethylene having weight average molecular weight of less than 1x 106, and ultrahigh-molecular weight polyethylene having weight average molecular weight of 1x 106 or more.