A method for manufacturing shoes is provided. The method includes preparing an upper and an outsole, applying an adhesive agent to the outer surface of an upper seal portion and the inner surface of an outsole seal portion, stitching together the outer surface of the upper seal portion and inner surface of the outsole seal portion, activating the adhesive agent by applying heat to the stitched seal portions, and molding the upper and the outsole by using a molding machine. Therefore, since the amount of the upper can be reduced and a separate insole is not necessary, the total weight of the shoes can also be reduced. The flexibility of shoes can also be enhanced.