The present invention relates to an alkaline battery separator comprising alkali-resistant fibers, beaten cellulose fibers, and a binder, wherein 1) an overall freeness, in terms of CSF, is at least 700 ml, wherein 2) weight ratios of the alkali-resistant fibers and the beaten cellulose fibers are 28:72 to 72:28, and wherein 3) the beaten cellulose fibers comprise mercerized natural wood fibers having a freeness, in terms of CSF, of at least 150 ml and less than 550 ml.