PURPOSE: To provide a titled device by which a thin amorphous metallic strip having a uniform thickness and good surface characteristic is obtained by providing a shielding body which shields the high velocity gaseous flow directing toward a nozzle for supplying molten metal on a roll under high speed revolution.

CONSTITUTION: The molten metal alloy 2 in a nozzle 3 in an electric furnace 4 is supplied through the nozzle 3 onto a roll 1 under high speed revolution in an arrow direction, whereby the molten alloy is solidified quickly and a thin amorphous metallic strip is made. A shielding body 8 which shields the gaseous flow 7 generated by the rotation of the roll 1 and directing toward the nozzle 3 is provided on the side opposite from the rotating direction of the roll when viewed from the nozzle 3. Of the flow 7, the gaseous flow 71 passing on the outer side of the roll 1 is kept apart from the roll 1 by the upper wall 83 in the large opening part 81 of the body 8. On the otherhand, the gaseous flow 72 passing on the inner side is conducted through the part 81 to an opening part 82, where the flow is turned into jets and is ejected toward the direction of the flow 7, thereby hindering the advance thereof and moving the flow apart from the roll 1. As a result, the inclusion of the molten metal supplied from the nozzle 3 is obviated, the size of the paddle of the molten metal is stabilized and the thin amorphous metallic strip having good quality is obtained.