A guide device which is a rotor manufacturing device includes a pair of sheet guides and a holder. The holder is disposed between the pair of sheet guides and includes a magnet outlet through which a permanent magnet is inserted into the slot from above. The pair of sheet guides is linearly symmetrical in a front view in which a side of the pair of sheet guides is located at the front. The axis of symmetry of the pair of sheet guides and the center axis of the magnet outlet are aligned with each other in the front view.