<p>Disclosed herein is a porous film having a thickness of 90 mu m or less obtained by uniaxially stretching a film produced by blow-extruding a composition comprising a linear polyethylene, a filler and a radical forming agent, the bending resistance of the porous film in both the machine and transverse directions being 50 mm or less, the moisture permeability of the porous film being 1500 g/m<2>.24hr or above, and the surface strength of the porous film satisfying the following relation (I): Surface strength (kg) >/= 35 x film thickness (mm) (I) and the process for producing the porous film defined above.</p>
