To provide a handy and durable umbrella cover and a method for manufacturing the same.

This umbrella cover comprises a plurality of synthetic resin barrels with different diameters connected to each other. A first inner rib 13 with the inner diameter Rn(i1) projecting inward is attached along the opening rim of each barrel 12 at one end, and an outer rib 14 with the outer diameter Rn(0) projecting outward and a second inner rib 15 with the inner diameter Rn(i2) projecting inward are along the opening rim of the barrel 12 at the other end. The size of these ribs is set as satisfies the following formula: Rn(0)>Rn+1(i1), Rn(0)<Rn+1(i2). In connecting the barrels 12, the barrels 12 are soaked in hot water to be softened so that the ribs are transformed to press a smaller diameter barrel into a large diameter barrel.