PURPOSE: An apparatus for measuring transformation of a pattern for a lost foam casting is provided to maintain the accuracy of the pattern in advance, thereby preventing the inferiority in size of a cast-iron product. CONSTITUTION: An apparatus for measuring transformation of a pattern(1) for lost foam casting includes a base(2) having a guide groove(21) in the upper surface, supporting blocks(6) installed on the base for supporting the pattern, a slider(3) movably inserted into the guide groove, a plurality of articulated arms(4) installed at the upper part of the slider and foldable at a predetermined angle, and an indicator(5) installed at the articulated arm and arranged adjacent to the pattern for measuring several places of the rotating pattern and measuring the degree of the transformation of the pattern with the difference of the maximum and the minimum.
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