PURPOSE: To provide a cleaning device for a flexible container bag shaped like a bag with both open ends, which is used for transporting mainly powder and granular material, with the capacity of cleaning and drying efficiently in a comparatively narrower space.

CONSTITUTION: This cleaning device for a flexible container bag consists of a chute introduced into an opening part at a specified pitch P of an endless transport means which performs an intermittent drive at a specified pitch and a hanging means which hangs a flexible container bag 1 in an open state. In addition, an intrabag cleaning step (position P4), a drying step for blowing a hot blast directly into the bag (positions P6 to P12) and a cooling step for supplying cool air at normal temperature into the dried bag (positions P13 to P16), are provided sequentially at specified positions.