PURPOSE: To improve the leakproofness of an alkaline battery by providing a highly viscous hydrophilic gel layer on the inner peripheral edge of a cathode can.

CONSTITUTION: Anode active substance 2 is contained in an anode can 1 of anode terminal, and cathode active substance 4 is contained in a cathode can via separator group 3, and ring-like packing 6 of L shape in cross section is interposed between the cathode can 5 and the anode can 1 to seal the port to thus form a button type battery. The cathode active substance 4 is of paste added with gelatinizer to zinc powder of main content. Highly viscous hydrophilic gel layer 7 is formed on the inner surface of the peripheral edge of the cathode can 5. This layer 7 is formed, for example, of gelatinizer such as CMC, PVA or polyacrylic acid sodium or the like and water.