The aim of this study was to develop the Tablet PC version of Self-Esteem Implicit Association Test (SE-IAT/Tablet) for children and to examine its reliability and validity. Participants were children in 5th to 6th grades. The reliability was examined using intraclass and Pearson’s correlations, which showed moderate levels of positive correlations in each gender group and overall. With respect to the validity, the scores of the SE-IAT/Tablet revealed significant positive correlations with the Paper and Pencil Version of Self-Esteem Implicit Association Test (SE-IAT/Paper) that is partially confirmed as a reliable and valid measure of autonomous self-esteem. Moreover, three-way analyses of variance (school×grades×sex) illustrated that both types of SE-IAT scores were higher in 6th grade than in 5th grade. Through these results, the current study successfully developed the SE-IAT/Tablet with a certain amount of reliability and validity. Limitations are discussed, along with the possibility to widely utilize the test in future fundamental and applied studies.