Various models of brake parts (products) are produced with a mixedly transferring production system. The mixedly transferring production system includes a top line, a first production line, a second production line, and a third production line, a mixedly transferring depot, a part depot, and a set assembling line, and a product depot (mentioned in order of processing flow). Out of them, the first to third production lines, the mixedly transferring depot form the mixedly transferring block division type of production system. In addition, an averaging post and a production order plate (kanban) sorter are provided (mentioned in order of production command flow).