This study aims at providing a detailed description of the ways to understand the development process of a primary school teacher on philosophy with children (PwC) approach. Action research was used as the research method since the problems determined in the current study can be iteratively solved with the development of the teacher. The study group consists of a teacher in a primary school located at the center of Bayburt, Turkey in the 2018-2019 academic year and 20 third-grade students. Qualitative data collection methods; observation, interview, field notes and diaries were used. A systematic analytical method was applied and the data were analyzed using a content analysis approach. The primary school teacher was provided with training on the PwC approach and eight action cycles were conducted regarding the implementation of this approach. Observations and interviews conducted in this process indicated that there are developments in the teacher in implementing the PwC approach and these developments positively affect some skills of the students. Based on the findings obtained in the current study, the authors made some recommendations for practice and future studies.T he argument of Matthew Lipman, who is recognized as the founder of Philosophy for Children, "critical thinking can be taught" might be explained to children through the metaphor 'teaching a man to fish'. Considering thinking is the most unique trait of human beings and this trait includes many human characteristics such as speaking, feeling, socializing, and creating a culture (Taşdelen, 2013); training of the thinking ability will be the development of the core of the human identity. Humans have the innate ability to think, however, thinking skills must be taught to develop this ability and prevent it from being lay fallow. Training of thinking ability is the basis of human education in every century and period (Taşdelen, 2013). Training of thinking skills does not