In the operation execution step wherein the operation switches are clicked to execute the operation related to product-type switching, if the substrate presence/absence detecting sensors S1, S2 that detect the presence/absence of substrates in the front-side substrate transporting mechanism 11A and rear-side substrate transporting mechanism 11B detect the presence of substrates, it is judged that the manufacturing operation of the corresponding substrate type has not ended, and the input control processing is executed so that the input operation by the operation switch for executing the operation related to product-type switching is prohibited. As a result, it is possible to prevent the problems related to reloading of the mounting program before the manufacturing has ended.