The purpose of this paper is to clarify the effect of experiences of internship program at vocational ability development center on students' vocational choice from the viewpoint of functions of significant other. The finding of this research is as follows; first is that the students have difficulties in deciding which internship program they choose, therefore they tend to compare various jobs. Second is that internship at vocational ability development center mainly provides two functions of significant other. Especially support and enjoyment functions influence students’ vocational experiences effectively.