To provide a device for discharging the content in a box-shaped molding flask in which the weight of a rotary reversing mechanism body and the whole device is simplified by detaching a drive part of a conveyor to carry the box-shaped molding flask into a rotary reversing mechanism and a drive part of the rotary reversing mechanism from the rotary reversing mechanism body.

A rotary reversing mechanism comprising an L-shaped frame 6 and a rotary shaft 7 is provided on a terminal part of a roller conveyor 1 to carry a box-shaped molding flask W, a winding machine 5 is provided thereabove, a wire 4 is connected to a lower side of the L-shaped frame 6, a free roller conveyor 8 is provided on a horizontal part of the L-shaped frame 6, and a rubber tire 14 capable of being driven in a forward/rearward direction to be elevated/lowered by a pneumatic spring 15 is provided below the L-shaped frame 6.