A substrate processing apparatus of the present invention is to apply processing using a processing liquid to a substrate. The substrate processing apparatus includes a first-side plate disposed oppositely to a first surface of the substrate with a distance and provided with plural discharge ports and suction ports in a surface opposing the first surface, a first-side processing liquid supply mechanism that supplies a processing liquid to the discharge ports in the first-side plate, and a first-side suction mechanism that sucks insides of the suction ports in the first-side plate.