To provide a cylindrical manganese dry battery having an excellent storing function by preventing air from flowing into the battery while being stored and preventing deterioration of voltage and current caused by air inflow.

This cylindrical manganese dry battery has such a constitution that, a closure body 7 provided with a carbon rod 6 in a center transmission hole 7a and in which the positive electrode terminal 11 is mounted on an upper end of the carbon rod 6, is disposed in an opening of a zinc can 1 filled with a positive electrode mix and a separator, and a negative electrode plate is disposed on a bottom of the zinc can 1, and a thermally contractible resin tube 10 is arranged on an outer periphery of the zinc can 1, and this thermo- shrinking resin tube 10 is thermally contracted so as to curl the opening end of the zinc can 1, and the closure body 7 is fastened and sealed by grooving. A silicone oil 12 is interposed in all surfaces or a part of surface defined between the zinc can 1 and the closure body 7. A viscosity of the silicone oil 12 is preferably set to 200-2000 cSt (25°C).