NOVELTY - The apparatus (1) has a cylindrical conveyance pipe (40) extended along conveyance direction of a granular material. A screw (50) is arranged in an inner side of the conveyance pipe. A screw drive part (53) rotates the screw. A screw shaft (51) is extended along the conveyance direction. Elasticity of an elastic membrane (90) is higher than that of a flight (52) and the conveyance pipe. Thickness (d1) of the elastic membrane is smaller than distance (d2) between an internal peripheral surface of the conveyance pipe and an edge of an outer side of the flight.    USE - Supply apparatus i.e. screw feeder, for supplying granular material e.g. fine powder of inorganic substance and organic substance and particles, to a subsequent apparatus in technical fields. Uses include but are not limited to a fine ceramic field, a metal material field, a polymeric material field, a battery field, an electronic material field, a composite material field, a pharmaceutical material field, a food material field, an electron field, an energy field, a medical treatment field and a foodstuff field.    ADVANTAGE - The pressure is absorbed by the elastic membrane, so that pressure concerning the granular material can be reduced, deposition solidification of the granular material can be suppressed between the internal peripheral surface of the conveyance pipe and the edge of the outer side of the flight, bulk density of the granular material can be raised between the flight and a discharge blade, the granular material can be discharged from a discharge port by constant quantity by scraping-off the granular material by the discharge blade, rotation of the granular material with respect to the flight can be suppressed and the granular material can be efficiently conveyed to a downstream a conveyance direction.    DESCRIPTION OF DRAWING(S) - The drawing shows a longitudinal cross-section view of a supply apparatus.    Thickness of elastic membrane (d1)    Distance between an internal peripheral surface of a conveyance pipe and an edge of an outer side of a flight (d2)    Supply apparatus (1)    Cylindrical conveyance pipe (40)    Screw (50)    Screw shaft (51)    Flight (52)    Screw drive part (53)    Elastic membrane (90)