Wafer holder for semiconductor manufacturing device and semiconductor manufacturing device equipped with the same

Abstract: A wafer holder uniformly heats a wafer at high temperatures without being damaged. A semiconductor manufacturing apparatus is provided with this wafer holder. The contact surface area where the wafer and the wafer mounting surface of the wafer-holding part are in contact includes a contact surface area A in an outer circumferential area that is farther than 1/√2R from the center of the wafer, where R is the radius of the wafer, and a contact surface area B in an inner circumferential area that is within 1/√2R of the center. The contact surface area is established so that A>B. In order to obtain this relationship, the wafer-contacting part of the wafer mounting surface is preferably formed into annular convexities or embossed convexities.