Patent ID: 8840752

Claim:
A substrate processing apparatus comprising: a processing unit configured to perform a processing while supplying a plurality of processing fluids of different kinds to a subject at different timings; a common flow path provided in the processing unit and configured to discharge the plurality of processing fluids of different kinds supplied to the processing unit; a plurality of exclusive exhaust paths exclusively provided for each of the plurality of processing fluids of different kinds configured to discharge the processing fluids; and a flow path switching unit configured to switch and connect the common flow path to one of the plurality of exclusive exhaust paths corresponding to one of the plurality of processing fluids of different kinds, wherein the flow path switching unit comprising: an outer tube provided with a plurality of connection holes, each connection hole formed in the circumferential wall of the outer tube with a predetermined interval along the longitudinal direction of the outer tube and connected to a corresponding exclusive exhaust path; a rotary tube rotatably inserted into the outer tube with a rotating shaft provided alone the longitudinal direction of the outer tube and provided with a plurality of openings, each opening formed in the circumferential wall of the rotary tube with a predetermined interval at a corresponding position to the connection holes of the outer tube along the longitudinal direction of the rotary tube and the rotating shaft, and connected to the common flow path; and a rotation driving unit configured to rotate the rotary tube, wherein only one of the plurality of openings of the rotary tube is aligned with only one of the plurality of connection holes of the outer tube during the rotation of the rotary tube, and only an aligned set of an opening of the rotary tube and a connection hole of the outer tube is sequentially communicated during the rotation of the rotary tube.