To provide an extensible transfer device for performing transfer by turning a spiral blade body.

The spiral blade body comprises a spiral blade body with a shaft having spiral blades on the outer periphery of a turning shaft and a spiral blade body without shaft having spiral blades wound on the turning shaft of the spiral blade body with the shaft. A blade body turning means for turning each spiral blade body is provided, the spiral blade body without shaft is extensible/contractible relative to the spiral blade body with the shaft due to rotation speed difference between the spiral lade body with the shaft and the spiral blade body without shaft. A cover of the spiral blade body with the shaft storing the spiral blade body with the shaft in it is provided slidably with a cover of the spiral blade body without shaft storing the spiral blade body without shaft in it. A cover turning preventing means for preventing the turning of the cover of the spiral blade body without shaft with respect to the cover of the spiral blade body with the shaft is interposed between the cover of the spiral blade body with the shaft and the cover of the spiral blade body without shaft.