To provide a can overturning prevention device in a can manufacturing facility which transfers a non-sucked can to a conveyance path at the entrance of the next step without colliding with a start end of the conveyance path of the next step tilted in the state of falling forward and overturning, and prevents it from overturning surrounding normal cans.

At the conveying direction rear part of a conveyance path 2 of the next step entrance following the conveyance path 1 of a can washing step exit in the can manufacturing facility, a roller 7 is provided as a non-sucked can raising part to be abutted on the lower end of a non-sucked can C2 held by a plurality of normal cans C1 sucked by a suction conveyance device 10. By the roller 7, the lower end height position of the non-sucked can C2 is matched with the lower end height position of the normal can C1, the non-sucked can C2 is transferred without being tilted in a state of falling forward and overturning on the conveyance path 2 of the next step entrance, and thus the overturning of the normal can C1 is prevented.