Abstract: This study is to verify that a participation of a consulted firm functions as a mediating effect in the correlation of a consultant’s problem solving ability to the performance satisfaction rate that a consultant experiences during a consulting process. The objects were the current management consultants who have performed the management consulting at least more than once and the direct survey was used to collect the data. The survey, in reference to the questionnaires in the precedent studies, was comprised of 7 questions of demographic statistics, 3 questions of problem solving skills, 3 questions of problem solving knowledge, 5 questions of participation of the consulted firm and 5 questions of satisfaction of consulting performance, a total of 23 questions in Likert’s 5 points scale measurements. In the results of the study model fitness test and the validity test analysis as a rotated element series, the 4 elements equivalent to the study model setup were extracted; the characteristic values were all higher then 1.0, the factor loadings were all above 0.5 and every variable was taken into the analysis. Including the parameter, the independent variable and the dependent variable’s explanatory total variance was 75.98% and the Cronbach-alpha value of the entire study model was 94.9%. In the correlation of a problem solving skill and a problem solving knowledge of a consultant to the performance satisfaction rate of a consultant, the effect of a participating consulted firm was analyzed and the results showed that the skill and the knowledge both were significant in the t and the p-values of the first, second and third steps and the independent variable effect in the second step showed a higher effect than the independent variable effect on the third step. These results indicate that the consultant’s problem solving ability influences the participation rate of a consulted firm and the performance satisfaction rate of the consultant. If this study may continue in the future, new tools to measure the problem solving skills and knowledge should be developed and the validity test of the tools also should be assessed.