The purpose of this study was to clarify the effects of participation in Friendship Program at Hiroshima University on change of students' self efficacy regarding teaching profession and of their cognition of abilities needed for teachers. Participants were 67 students who took part in Friendship Program held in 2011. The results showed the following: 1) Self efficacy regarding formation of relationship between children and themselves was improved, but self efficacy regarding formation of children's group was not improved very much. 2) Cognition of abilities needed for forming children's group changed in 50% of the students, but cognition of abilities needed for forming relationship between children and themselves changed in only 25% of the students. 3) The change of cognition of abilities needed for teachers had a negative effect on the change of self efficacy regarding teaching profession, and performance accomplishments during Friendship Program had a positive effect on the change of self efficacy.