To provide lightweight shoes with excellent cushioning properties by forming a hollow sealed in a shoe bottom by a simple method.

An intermediate bottom 2 with hollows 21, 21... whose underside is opened 211, 211... and insulating bodies 22, 22... is molded on the underside of a heel 1. Thereafter, a gap 4' for molding an outer bottom is formed below the intermediate bottom 2 and a molding material for the outer bottom is injected and by molding the outer bottom 4 while the openings 211, 211... of the hollows 21, 21... are closed with the insulating bodies 22, 22... by injection pressure, the hollows 21, 21... are tightly sealed in the shoe bottom.