A sound wave levitation device levitates a glass ribbon that is continuously drawn out from a plate glass forming device by radiation pressure of sound waves when the glass ribbon is conveyed, and is provided with: a diaphragm having an upper surface for radiating sound waves to a portion with a temperature of 300-800°C of the glass ribbon with a width of 1-8 m and a plate thickness of a central portion thereof in a width direction of 0.05-3 mm; and a reflector having an upper surface for reflecting sound waves radiated from the lower surface of the diaphragm. The longitudinal direction of the diaphragm is parallel to the width direction of the glass ribbon, and the cross-sectional shape of the upper surface of the diaphragm is an upward protruding shape.
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