A production schedule creating method includes: acquiring production sequence information including a production sequence for producing a plurality of models of products and preparation work sequence information including a sequence of arrangement work of arranging members corresponding to the plurality of models on arrangement means which is attached to production equipment so as to arrange the members that are used for production of the products; acquiring arrangement means information including production arrangement means information that is information of the arrangement means attached to the production equipment and equipment detached arrangement means information that is information of an equipment detached arrangement means that is not attached to the production equipment; optimizing a production schedule obtained after a time point of acquisition of the arrangement means information, based on the production sequence information, the preparation work sequence information, and the arrangement means information.