In order to confirm the validity of the state self-esteem measurement using the two-item self-esteem scale, we conducted a diary study to measure state self-esteem every evening in a week by two methods, the paper-writing version and the Web survey version. The validity of the measurement was confirmed regardless of the difference in the method, with positive correlations with the state self-esteem scale made by  previous studies, positive / negative daily event experiences, and positive / negative daily emotional experiences.