To provide an apparatus with a high degree of reliability for supplying molten metals which resolves sealing defects resulting from misalignments of the shaft with a communicating mouth opening 28 because a stopper 8 rocks to function as a switching means.

The apparatus consists of a holding furnace 1 to hold molten metals, a dipping room 5 communicating with the holding furnace 1 and the stopper 8 as a switching means to switch the communicating mouth opening 28 located at the communicating mouth opening in the dipping room 5 and whenever the stopper 8 begins to move, a press-fit section 33 is always inserted into the communicating mouth opening 28 and a groove section 34 where molten metals flow in parallel with the shaft is placed in the stopper 8.