In this paper, an attempt is made to formulate the optimum aseismic design using the concept of fuzzy mathematical programming. While the fuzzy mathematical programming can be applied to optimum aseismic design, it is necessary to consider carefully the aggregation of contradictory components for practical purposes. To find an adequate way of aggregating objective functions, we conducted a survey, during which several sets of questionnaires were distributed among experienced engineers to find their preference in the design of earthquake-resistant structures. Results of these questionnaires are collected and analyzed by using the pairwise comparison method. By using several numerical examples, the present method is illustrated and compared with the previous results using the minimum operator.