To provide a porous film which combines high liquid-leakage preventing properties and high gas permeability, regardless of the position of the film, and a method for manufacturing the same.

There is provided a porous film which comprises 60-85 vol.% of a polyolefin resin and 40-15 vol.% of a finely powdered filler and is stretched at least uniaxially, wherein the maximum value of the maximum pore diameter of pores formed in the porous film is 0.5 μm or less, and the moisture permeability is at least 500 g/m2.24 hr.