A tundish including a weir between molten steel pouring portion and molten steel outlet port, the weir including wall portion and hood-shaped portion at upper end of wall portion surrounding molten steel pouring portion from all sides of molten steel pouring portion and extending upward from bottom of tundish, and hood-shaped portion facing molten steel pouring portion and protruding in horizontal direction, wherein weir includes one or more notches continuous from wall portion to hood-shaped portion, and includes refractory bottom surrounded by wall portion and including first porous portion, and also includes first gas inlet pipe connected to first porous portion within weir and within refractory including first porous portion, and tundish further includes bottom refractory provided with second porous portion and with second gas inlet pipe connected to second porous portion, at bottom of tundish between weir and molten steel outlet port.

A continuous casting tundish including: a reservoir that stores supplied molten steel, wherein the reservoir comprises: one or more molten steel outlets that allow the molten steel to exit therethrough, and a weir having a hollow cylindrical shape located at an upstream side of the molten steel from the one or more molten steel outlets, the weir including: a bottom; a wall rising from the bottom; an eave provided at an end of the wall, the eave covering a periphery of the wall and facing the bottom; and a gas supply unit that supplies an inert gas to an interior space enclosed by the wall and the bottom.

A continuous casting tundish including: a reservoir that stores supplied molten steel, wherein the reservoir comprises: one or more molten steel outlets that allow the molten steel to exit therethrough, and a weir having a hollow cylindrical shape located at an upstream side of the molten steel from the one or more molten steel outlets, the weir including: a bottom; a wall rising from the bottom; an eave provided at an end of the wall, the eave covering a periphery of the wall and facing the bottom; and a gas supply unit that supplies an inert gas to an interior space enclosed by the wall and the bottom.