According to one embodiment, a substrate processing apparatus (1) includes: a support (4) configured to support a substrate (W) in a plane; a rotation mechanism (5) configured to rotate the support (4) about an axis that crosses a surface of the substrate (W) supported by the support (4) as a rotation axis; a plurality of nozzles (6a, 6b, 6c), which are aligned from the center toward the periphery of the substrate (W) supported by the support (4), configured to eject a treatment liquid to the surface of the substrate (W) on the support (4) being rotated by the rotation mechanism (5), and a controller (9) configured to control the nozzles to eject the treatment liquid at different ejection timings according to the thickness of a film of the treatment liquid formed on the surface of the substrate (W) on the support (4) being rotated by the rotation mechanism (5).