The purpose of this study was to deeply understand how teachers who are parents and support their children’s schooling perceive and participate in private tutoring. Four female teachers, who worked at a middle school or a high school located in G metropolitan city and had children attending school, were selected as research subjects. In-depth interviews were conducted to reveal the particularities of their perceptions of private tutoring and participating behaviors in it by comparing them with other parents. The results showed that the teachers perceived private tutoring as inevitable for their children to compete and thus get admissions from selective universities, just like other parents in the situation where college entrance examinations are considered extremely competitive in credential society. However, the teachers' attitudes and utilization strategies towards private tutoring became different based on whether they support their children’s education related to their major subjects or other subjects in schools. With an expert level of content and pedagogical knowledge, they supported their children's education related to their majors by using private tutoring in a very sophisticated way, whereas they tended to just follow other parents in non-major private tutoring. However, regardless of subjects, they tried to objectively evaluate their children’s academic achievement and invest rationally in private tutoring, as they had a lot of experiences regarding testing other students in their schools. They also believed that they could contribute to reducing the demand for private tutoring to improve academic achievement among students, including their children, through reforming their classes in which all students can participate in class activities and thus feel rewarded. Finally, the scholarly significance of this study can be found to clarify the impact of private tutoring as an inevitable way of parental educational involvement, particularly among teachers who are parents, and to help understand their perceptions of the relationship between formal schooling and private tutoring, using the concept of habitus.