Patent ID: 8356951

Claim:
A wet-processing apparatus that processes a substrate horizontally held by a substrate holder by a wet process that spouts processing liquids supplied by a processing liquid supply system onto a surface of the substrate, said wet-processing apparatus comprising: processing liquid spouting nozzles respectively for spouting the processing liquids supplied by the processing liquid supply system; a light source for illuminating an area between a plane containing tips of the processing liquid spouting nozzles and the surface of the substrate; an imaging device for forming an image of at least the area between the plane containing the tips of the processing liquid spouting nozzles and the surface of the substrate in an area including the processing liquid spouting nozzles and the surface of the substrate; a control unit that provides a spout signal requesting spouting the processing liquid from the processing liquid spouting nozzle toward the substrate, and an imaging signal requesting the imaging device to start an imaging operation; and a decision unit that decides whether or not the processing liquid was spouted from the processing liquid spouting nozzle and whether or not changes occurred in the condition of the processing liquid spouted from the processing liquid spouting nozzle on the basis of an image formed by the imaging device and expressing luminous intensity of light emitted by the light source, and penetrated into and reflected by the processing liquid spouted toward the substrate.