A bulk component supply system which includes a bulk component supply device which is moved together with a mounting head; and a method for replenishing bulk components to that bulk component supply device are disclosed. A passage-equipped component case of a bulk component supply device which is moved together with a mounting head is removed, held by the empty one of case holding sections of a slide in the bulk head component case exchange region. Bulk components are replenished and a passage-equipped component case held on the other of the case holding sections is held on the mounting head. The slide is moved to a bulk component replenishment region, and components are automatically replenished from bulk component storage vessel to the passage-equipped component case received from the mounting head which is empty. After replenishment, the slide is moved to a bulk component case exchange region.