To provide a working place optimization scheduling method and a device capable of appropriately allocating working places for manufacturing respective products in a plant for manufacturing heavy industrial products and leveling worker distribution load.

In the case of making a production plan of a plant having plural substitutive working places, a central processing part 1 prepares the combinations of working places in each product sort while referring to data from a construction information database 2a, a working information database 2b and a plant model database 2c and selects the combination of working places optimum to each product sort from combinations satisfying restriction to the working places.