<p>A powder separation device achieving improved powder-particle collection efficiency with an increase in accessory power and an increase in the size of the device kept to minimum levels. The powder separation device (1A) separates and recovers powder from air flow conveying the powder in a solid-air two-phase state. A drift flow forming section (10) is provided near a body connection section of solid-air supply piping (3) for causing solid-air two-phase flow to circumferentially flow into a separator body (2). The drift flow forming section (10) concentrates highly concentrated powder particles of the solid-air two-phase flow to the outer peripheral side of the separator body (2).</p>
