The purpose of this study is to provide human pelception data for medium and minor earthquake motions in base-isolated buildings. Results in this study are suggested to be used in Limit State Design for medium and minor earthquakes. Surveys were carried out for 14 base-isolated buildings in Kwanto area. The data in this survey are response to some questionnaires by residents and measured acceleration records. The mean of human perception limit against earthquake is found to be 3.65 cm/s^2, and the coefficient of variation is 80%, provided that the logarithmic normal distribution is assumed for the distribution of sentience ratio defined in this paper.
