Production schedule creating method and production schedule creating apparatus

A production schedule creating method used in a production schedule creating apparatus that creates a production schedule in a production line for producing a plurality of models of products, the method comprising:

• a schedule information acquiring step of acquiring production schedule information including a production sequence for producing the plurality of models of products, a commenceable time point when production of the plurality of models of products is commenceable, and a production deadline time point;
• a preparation time calculating step of calculating a preparation time taken for arrangement work of arranging members corresponding to the plurality of models on arrangement means which is attached to the production line so as to arrange the members that are used for production of the products, for each of the plurality of models, based on the production sequence;
• a production time point calculating step of calculating a production commencing time point and a production end time point for each of the plurality of models, based on the production sequence and the preparation time;
• a schedule satisfaction determining step of determining whether or not a schedule condition is satisfied for each of the plurality of models, the schedule condition being satisfied when the production commencing time point is later than the commenceable time point and the production end time point is earlier than the production deadline time point;
• and
• after determining that an unsatisfied model, a model in which the schedule condition is not satisfied, is present, a sequence changing step of changing a sequence of the unsatisfied model in the production sequence so that the unsatisfied model satisfies the schedule condition.