Abstract: A component holder is reeled out from a storage reel and conveyed to a component-storage working position by a conveyor device. A control unit stops the conveyance of the component holder if it receives a non-storage or incomplete-storage signal. The component holder includes a multiplicity of component storages for storing the components therein are provided longitudinally and each has an opening on one surface. Each of the component storages has a shutter which becomes stable both at a projectional position and at a retreat position. The shutter is moved between the two positions by more than a certain sufficient level of urging force. The components are stored in the component storages with the shutters in the retreat positions, while the openings of the component storages are directed upward.