To provide a shaftless rotary structural body having sufficient rigidity to the stress in rotation, and capable of easily replacing component members.

This shaftless rotary structural body has end rotary members 2 positioned at left and right both ends and rotated by the driving force, one or plural intermediate rotary members 4-8 mounted between the left and right end rotary members, and a connection rod 9 penetrating through the intermediate rotary member and extending to the end rotary members. The left and right end rotary members and the intermediate rotary member, or the left and right end rotary members and the intermediate rotary member, and the mutual intermediate rotary members, are connected by demountable connecting means 13, while the end rotary members are connected to each other through the left and right ends of the connection rod, and the end rotary members and the intermediate rotary members are rotated integrally.