There are provided a susceptor having a recessed wafer mounting section, in which a semiconductor wafer is mounted and which is configured to include a circular bottom portion and a side wall portion, on an upper surface, a reaction chamber in which the susceptor is provided, an imaging unit that is provided above the reaction chamber and images the semiconductor wafer and the wafer mounting section, and an image analysis unit that analyzes the deviation of the semiconductor wafer from the wafer mounting section on the basis of an image captured by the imaging unit.