Patent ID: 8854449

Claim:
A substrate position detection method carried out in a semiconductor fabrication apparatus provided with a process chamber where a predetermined process is carried out with respect to a substrate, and a susceptor that is rotatably housed in the process chamber and has a substrate receiving portion in which the substrate subject to a position detection is placed, the substrate position detection method comprising the steps of: rotating the susceptor so that the substrate receiving portion is moved into an image taking area of a imaging apparatus; detecting first two position detection marks provided in the process chamber so that the first two position detection marks are within the image taking area, wherein a first perpendicular bisector of the first two position detection marks passes through a rotational center of the susceptor; detecting second two position detection marks provided in the susceptor so that the second two position detection marks can be within the image taking area, wherein a second perpendicular bisector of the second two position detection marks passes through the rotational center of the susceptor and a center of the substrate receiving portion; and determining whether the substrate receiving portion is positioned in a predetermined range in accordance with the detected first two position detection marks and the detected second two position detection marks.