composition had an a c18 b c8 b c8 content of 26 1 and an a c18 a c18 b c8 content of 3 0 based on the whole fat composition a modifying agent for a plastic fat as a fat composition composed of a mixture of an abb type triglyceride as a c16 to c22 b c8 b c8 in which a was stearic acid c18 palmitic acid c16 arachidic acid c20 or behenic acid c22 and b was caprylic acid c8 and an aab type triglyceride as a c16 to c22 a c16 to c22 b c8 in which a is stearic acid c18 palmitic acid c16 arachidic acid c20 or behenic acid c22 and b was caprylic acid c8 was prepared as follows to 30 parts of extremely hardened high erucic canola oil behenic acid 49 stearic acid 39 arachidic acid 8 palmitic acid 4 70 parts of mct medium chain fatty acid triglyceride u201c actor m2 u201d manufactured by riken vitamin co ltd caprylic acid melting point 16 5 u00b0 c 99 8 actual measured value was mixed and the mixture was treated in the same manner as in example 1 to give a transesterified fat having a b c8 b c8 b c8 content of 45 1 an a c16 to c22 b c8 b c8 content of 40 0 an a c16 to c22 a c16 to c22 b c8 content of.