To enhance the hydrophilic, liquid retainment, and weatherproof properties.

A blending paper made of 40 or 95wt.% of polyolefine synthetic pulp including 0.7 or 10.0wt.% of polyvinyl alcohol and 5 or 60wt.% of polyolefine thermal fusing fiber binder is thermally fused, and a surface active agent is contained. This separator for alkaline battery is manufactured by wetly making the blending paper of polyolefine synthetic pulp and polyolefine thermal fusing fiber binder, thermally processing at temperatures ranging from a fusing point of polyolefine thermal fusing fiber binder to a melting point of polyolefine synthetic pulp after drying, and adding a surface active agent after wet paper making and/or heat treatment.