1. A design and manufacturing management system composed of a design management unit and a manufacturing management unit, wherein, in the design management unit, a design processing unit for managing a design drawing, which has been created by means of computer aid, by storing the design drawing in a design drawing database, a drawing edit management unit for managing an E-BOM created from the design drawing by storing the E-BOM in an E-BOM database, and for notifying the manufacturing management unit of design completion, and a design change display processing unit for causing design change permitted range and forbidden range to be displayed, upon design change of the product, in accordance with design change verification information in a design change verification database are provided; and in the manufacturing management unit, a part order management unit for requesting confirmation when receiving the design completion notice from the drawing edit management unit, and managing a M-BOM, to which preparation information including an order instruction and a manufacturing instruction of a part is added and which has been created in accordance with the E-BOM after a confirmation response is input, by storing the M-BOM in a M-BOM database, and a design change verification processing unit for managing the design change verification information which has been created in accordance with the preparation information of the M-BOM by storing the design change verification information in the design verification database are provided.