To provide a runner brick discharge apparatus of a bottom board capable of eliminating heavy work on a heated bottom board.

The runner brick discharge apparatus of the bottom board includes an inversion frame 3 supported by shaft members 31, 32 so as to be turnable from a horizontal position to a position other than the horizontal position and receiving the bottom board 1 traversely carried on a plate surface in the horizontal position, a regulating member 6 provided in the inversion frame 3 and positioning the bottom board 1 received on the plate surface, and a motor 34 for turning the inversion frame 3 between the horizontal position and the position other than the horizontal position.