Abstract: Provided are: a porous film for a heat-sealable bag-constituting member which has a high seal strength and is resistant to edge tear when heat-sealed to form a bag, and excels in workability (bag productivity); and a porous film for a heat-sealable bag-constituting member which enables the use of a polyolefinic nonwoven fabric to be laminated (combined) therewith. The porous film (11) for a heat-sealable bag-constituting member includes a porous film layer (layer A) (11a) and another porous film layer (layer B) (11b). Resinous component(s) constituting the layer A (11a) contains 50 percent by weight or more of at least one polyethylene (a) having a melting point of 90° C. or higher and lower than 110° C., and resinous component(s) constituting the layer B (11b) contains 50 percent by weight or more of at least one polyethylene (b) having a melting point of 110° C. or higher and 140° C. or lower.