Patent ID: 8730317

Claim:
A substrate processing apparatus, comprising: a holding unit holding a substrate; a rotation driving unit rotating the substrate held on said holding unit; a moving mechanism moving said holding unit between a delivery position where the substrate is delivered from/to an outside and an edge exposure position where edge exposure processing is performed on an edge portion of a coating film formed above the substrate; an exposure unit provided on the edge exposure position side and exposing the edge portion of the coating film above the substrate held on said holding unit; an image capturing unit provided on the edge exposure position side and above said exposure unit and capturing an image of the substrate held on said holding unit; and a direction change unit provided between the delivery position and the edge exposure position and changing a direction of an optical path formed between the substrate held on said holding unit and said image capturing unit, wherein said direction change unit comprises: a first reflecting mirror reflecting light reflected upward in a vertical direction from the substrate, in a horizontal direction to the edge exposure position side; a second reflecting mirror reflecting light from said first reflecting mirror, obliquely upward at a predetermined reflection angle to the delivery position side; and a third reflecting mirror reflecting light from said second reflecting mirror, in a horizontal direction to the edge exposure position side to transmit the light to said image capturing unit.