A batch weighing/supply device in which an inner tube is provided above a circular bottom plate on a shared central axis (c) and with a predetermined gap therebetween, an outer tube is provided on the circular bottom plate concentrically with the inner tube such that an annular passage is formed between the inner and outer tubes (2, 3), a raw material in the inner tube is paid out to the annular passage side from a lower end (2") of the inner tube at a predetermined angle of repose (θ), a plurality of rotary blades (8, 10) are provided so as to rotate on the circular bottom plate about the central axis (c), a discharge port for the raw material conveyed through the annular passage by the rotary blades (8, 10) is provided in the annular passage, and weighing means is provided to weigh the raw material discharged through the discharge port, wherein, in the annular passage, a primary height adjustable scraper that reduces the quantity of conveyed raw material when lowered is provided on an upstream side of the discharge port, and a secondary height adjustable scraper that further reduces the quantity of conveyed raw material, after the quantity has been reduced by lowering the primary height adjustable scraper, is provided on a downstream side of the primary height adjustable scraper and directly adjacent to the discharge port on the upstream side thereof, respective side edges of both the primary and the secondary height adjustable scrapers are provided in positions a fixed distance away from respective side faces of the annular passage, an upstream-side edge portion of the discharge port is formed as an inclined side edge that intersects the rotary blades (8, 10), the secondary height adjustable scraper being provided to extend along the inclined side edge, control means is provided to reduce the rotation speed of the rotary blades (8, 10) to a first speed, which is lower than a normal rotation speed, when the primary height adjustable scraper is lowered and reduce the rotation speed of the rotary blades (8, 10) to a second speed, which is lower than the first speed, when the secondary height adjustable scraper is lowered, and a sliding gate capable of opening and closing a raw material drop-down path is provided in a chute unit (25, 29) provided under the discharge port. wherein, in the annular passage, a primary height adjustable scraper that reduces the quantity of conveyed raw material when lowered is provided on an upstream side of the discharge port, and a secondary height adjustable scraper that further reduces the quantity of conveyed raw material, after the quantity has been reduced by lowering the primary height adjustable scraper, is provided on a downstream side of the primary height adjustable scraper and directly adjacent to the discharge port on the upstream side thereof, respective side edges of both the primary and the secondary height adjustable scrapers are provided in positions a fixed distance away from respective side faces of the annular passage, an upstream-side edge portion of the discharge port is formed as an inclined side edge that intersects the rotary blades (8, 10), the secondary height adjustable scraper being provided to extend along the inclined side edge, control means is provided to reduce the rotation speed of the rotary blades (8, 10) to a first speed, which is lower than a normal rotation speed, when the primary height adjustable scraper is lowered and reduce the rotation speed of the rotary blades (8, 10) to a second speed, which is lower than the first speed, when the secondary height adjustable scraper is lowered, and a sliding gate capable of opening and closing a raw material drop-down path is provided in a chute unit (25, 29) provided under the discharge port.