The purpose of this report was to investigate the measuring techniques for "body composition (estimated % fat)" as an item of Health-related physical fitness test(HRPF test) for students and staffs in Keio university. In this report, Bioelectorical Impedance analysis (BI method) and ultrasound method were compared as the measuring techniques. Particularly, we had to confirm the BI method which we adopt for our HRPF test. Subjects were male students, female students, male athletes and female adults who were not students, and we measured their %fat. A significant correlation was observed in estimated % fat derived from BI and ultrasound method. It meant that BI method had a certain reliability for %fat estimation. However, there were some differences between estimated values from BI and ultrasound methods depending on the subjects. Therefore, we have to recognize the fact that there might be some errors to measure and evaluate the values considerably. We primarily need a simplified procedure to obtain the value in order to measure a lot of subjects in a limited period, and also reliability of the method. From the result of this study, BI method was considered to be effective for the HRPF test in our university.