Patent ID: 6863734

Claim:
A substrate processing apparatus which processes a substrate, comprising: a substrate holding body which holds the substrate; a heater which heats the substrate through said substrate holding body; at least one thermometer extending through said heater, which measures temperature of said substrate holding body from a rear surface side of said substrate holding body without contacting with said substrate holding body, which is opposite to a surface side on which the substrate is held; a monitor which monitors a warping amount of the substrate having a correlation with the temperature of said substrate holding body, based on the measured value of said at least one thermometer; and a rotator which rotates said substrate holding body relatively to said at least one thermometer, wherein said at least one thermometer measures the temperature of the rear surface of said substrate holding body in a circumferential direction, which is rotated relatively to said at least one thermometer by said rotator, and wherein said monitor monitors the warping amount of the substrate in the circumferential direction, based on the measured value of said at least one thermometer.