PROBLEM TO BE SOLVED: To quantitatively calculate the amount of soot remaining in a part after cleaning a part used in a state where soot discharged from an internal combustion engine can be accumulated, and a soot residual amount calculation device. I will provide a. SOLUTION: The soot residual amount calculation method M100 for calculating the amount of soot remaining in a part after cleaning a part used in a state where soot discharged by an internal combustion engine can be accumulated, and is unique to the part before use. The pre-use invariant mass acquisition step S101 for acquiring the mass, the post-cleaning invariant mass acquisition step S102 for acquiring the invariant mass after cleaning the part, and the pre-use invariant mass acquisition step S101 for acquiring the part before use. And the soot residual amount calculation step S103 for calculating the amount of soot remaining in the part after cleaning the part based on the invariant mass after cleaning of the part acquired in the invariant mass acquisition step S102 after cleaning. The problem can be solved by the calculation method M100. [Selection diagram] Fig. 1
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