A semiconductor manufacturing apparatus includes a vacuum chamber, a rotary member, a first magnet, a second magnet, and a magnetic body. The vacuum chamber contains a substrate and a target located opposite to the substrate. The rotary member has a first surface located on a back side of the target outside the vacuum chamber. The first magnet is provided on the first surface. The second magnet has a magnetic pole opposite to a magnetic pole of the first magnet and is provided on an inner side of the first magnet on the first surface. The magnetic body is provided between the first magnet and the second magnet and is configured to be movable backward and forward in a vertical direction.