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1. A substrate processing apparatus, comprising: a process chamber; a susceptor in the process chamber, the susceptor has an upper surface on which a substrate is mountable and a step surface located at a level lower than the upper surface; a first edge ring on the step surface; a second edge ring outside the first edge ring; a third edge ring on the first edge ring and the second edge ring; and an actuator and a lift pin to vertically move the third edge ring, wherein: the first edge ring and the second edge ring are stationary relative to the susceptor, the third edge ring is coupled with the first edge ring and the second edge ring such that the third edge ring is vertically movable relative to the first edge ring and the second edge ring, the first edge ring has a U-shaped cross-section that includes a first inner ring and a first outer ring, which protrude upwardly, and a first insertion groove between the first inner ring and the first outer ring, the second edge ring has a U-shaped cross-section that includes a second inner ring and a second outer ring, which protrude upwardly, and a second insertion groove between the second inner ring and the second outer ring, the third edge ring has a third inner ring inserted into the first insertion groove, a third outer ring inserted into the second insertion groove, and a third insertion groove into which the first outer ring and the second inner ring are inserted, and the lift pin vertically extends between the first edge ring and the second edge ring and is connected to the third edge ring.
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