Patent ID: 8525418

Claim:
An electrostatic chuck comprising: a metal base having at least one through hole; a ceramic body covering said through hole; a suction electrode provided in said ceramic body; and a heating element provided in said ceramic body, wherein a heating value per unit area in a projection region of each of said at least one through hole is 50% or less of a heating value per unit area in an outer region, wherein said projection region is a region defined by projecting said through hole toward said ceramic body, and said outer region is a region determined by magnifying said projection region at a similarity ratio of three while setting an areal center of gravity of said projection region as a center of similarity, but excluding an interior of said projection region and wherein a lower surface of said ceramic body covers said at least one through hole and said ceramic body comprises: a concave portion formed in the lower surface of said ceramic body and in communication with said at least one through hole of said metal base, wherein an upper end of said concave portion is at a position that is lower than that of the heating element; a metallization layer formed in said concave portion; a conductive pattern connected to said metallization layer; and a via penetrating through a portion of said ceramic body and connecting said heating element and said conductive pattern.