Powder supply device

A powder supply device comprising:

• a hopper that accommodates powder and has a funnel-shaped inner wall surface of which an inner diameter is decreased downward, the inner wall surface having at least two surfaces of a gentle slope surface having a relatively gentle tilt angle with respect to a horizontal direction and a steep slope surface having a relatively steep tilt angle with respect to the horizontal direction and having one or more boundary portions that change from the gentle slope surface positioned relatively upward to the steep slope surface positioned relatively downward;
• a tubular discharge unit that is connected to a lower portion of the hopper and in which a discharge port through which the powder is discharged is formed at a lower end;
• and
• an auger screw, at least a part of which is disposed in the discharge unit, which transports the powder toward the discharge port, and which has a rotation axis extending in an up-down direction along a cylinder axis of the discharge unit and a helical blade provided around the rotation axis.