The purpose of this study was to examine the effect of the educational support program, which offered at the Niko Niko Room of the Center for School Education and Research of Hiroshima University in 2017, on school children. Twelve school children and their guardians answered questionnaires about the program. Results showed the following: (1) Educational support had a positive effect on children’s “self-efficacy regarding arithmetic”. (2)Both children and guardians positively evaluated the effects of this program, and both of them estimated students’ abilities high. (3)Children’s estimation of students’ communication and understanding had positive relations to their “interests in arithmetic”.