To provide a cotton candy preparing device (100) for preparing cotton candy in a good condition at all times irrespective of different heating conditions for granulated sugar and sugar candy, a cotton candy preparing device (100) having a rotary pot (260) formed of a pot upper portion (261) and a pot bottom portion (310) is provided, and the pot upper portion (261) has a loading port (267) at an upper end thereof and further tubular inner walls (281, 283) below the loading port (267), lower ends of the inner walls (283) have a conically shaped expanded inclined portion (285) that expands downwards, a plurality of plate-shaped ribs (287) are provided on the expanded inclined portion (285) so as to project towards a center of the rotary port (261), and lower ends of the ribs (287) are brought into contact with a heating plate provided on an upper surface of the pot bottom portion (310) or form a slight gap between the heating plate and themselves.
