<p>A microporous polyolefin film which has excellent winding stability in a production line or processing line for the microporous polyolefin film and in a line involving the step of winding in cell fabrication. The wound microporous film is less apt to slip and form an uneven edge face upon impact. The microporous polyolefin film has a compressive modulus of 0.1-1,000 kPa and a ratio of the machine-direction tensile modulus to the transverse-direction tensile modulus of 1.5-7.8.</p>