Pairwise comparison has been widely employed as an easy method for sub- jective evaluation of several candidates to develop new products or to improve service. In this paper, a method using response time has been proposed to improve the accuracy of pairwise comparison. Firstly, a pairwise comparison experiment was conducted to investigate the relationship between response time and difficulty of judgement. Then, a method to improve the accuracy of calculated scales of the objects has been proposed where the answer of the pairwise comparison was modified by using the response time and correction function. In this study, three correction functions were compared to find the difference of the accuracy improvement, and two of them showed significant improvement.