A caulking fixation type power element for attaching to an upper end of a valve main body of an expansion valve via a caulking portion, comprising: a diaphragm; an upper lid member, said upper lid member and said diaphragm form a pressure actuation chamber which seals a working gas; a receiving member comprising a center portion with a through hole, said receiving member is arranged such that said diaphragm is sandwiched between said upper lid member and said receiver member and such that a lower space is formed between said diaphragm and said receiving member; and a stopper member which is arranged in said lower space, wherein outer peripheral portions of said upper lid member, said diaphragm and said receiving member are integrated according to a circumferential welding, wherein said receiving member comprises an annular outer peripheral portion, a first bottom surface portion that is provided in an inner side of the outer peripheral portion such that the first bottom surface portion is essentially parallel to and at a lower elevation than the outer peripheral portion, and a second bottom surface portion that is provided further in an inner side of the first bottom surface portion such that the second bottom surface portion is essentially parallel to and at a lower elevation than the first bottom surface portion, wherein said stopper member comprises a main body portion, and a flange portion, said flange portion is formed in one end of said main body portion with a diameter larger than said through hole of said receiving member, and characterised in that said stopper member is arranged such that said main body portion is inserted to said through hole and such that said flange portion is arranged in said lower space for contacting with the second bottom surface portion of said receiving member. a diaphragm; an upper lid member, said upper lid member and said diaphragm form a pressure actuation chamber which seals a working gas; a receiving member comprising a center portion with a through hole, said receiving member is arranged such that said diaphragm is sandwiched between said upper lid member and said receiver member and such that a lower space is formed between said diaphragm and said receiving member; and a stopper member which is arranged in said lower space, wherein outer peripheral portions of said upper lid member, said diaphragm and said receiving member are integrated according to a circumferential welding, wherein said receiving member comprises an annular outer peripheral portion, a first bottom surface portion that is provided in an inner side of the outer peripheral portion such that the first bottom surface portion is essentially parallel to and at a lower elevation than the outer peripheral portion, and a second bottom surface portion that is provided further in an inner side of the first bottom surface portion such that the second bottom surface portion is essentially parallel to and at a lower elevation than the first bottom surface portion, wherein said stopper member comprises a main body portion, and a flange portion, said flange portion is formed in one end of said main body portion with a diameter larger than said through hole of said receiving member, and characterised in that said stopper member is arranged such that said main body portion is inserted to said through hole and such that said flange portion is arranged in said lower space for contacting with the second bottom surface portion of said receiving member.