Provided is a powder supply device including a storage tank in which an internal space that stores powder and a discharge port that discharges the powder from the internal space to outside are formed, a roller that has an outer peripheral surface formed of a rough surface and is rotatably provided, in the discharge port, to face both the internal space and the outside, and a doctor blade that is provided at the discharge port and faces the outer peripheral surface of the roller. The internal space includes a first chamber into which the powder is charged and a second chamber in which the doctor blade is disposed. The first chamber communicates with the second chamber via an opening. A partition member that restricts the width of the opening is provided between the first chamber and the second chamber. The powder charged into the first chamber moves to the second chamber through the opening.