This study was intended to clarify the actual state of "reflection" conducted by an elementary school teacher educator. Two interview surveys using a research method called "self-study" (Loughran, 2019) supported by a "critical friend" (Schuck, & Russell, 2005) that encourages a teacher educator in ones’ "reflection" .The following four results were obtained: 1) In the first half and the second half of teacher educator’s guidance and advice, the categories of “reflection” were found when teacher educator A climbed from the first stage of the “coach's ladder” and from the second to the third stages. 2) The composition of the “framework of values and worldview behind evaluation” proposed by Mishina (2017) remained the same throughout the first and second half. 3) ① From the first half of the TT class, the teacher educator built a relationship of trust with, understood, and supported the teacher. ② The teacher educator addressed similar gymnastic apparatus in the first and second half. For these reasons, no difference was observed in the composition of the conceptual diagram for the three major categories. 4) In the second half of the TT classes, teacher educator A understood the position of teacher K, who was instructed and advised and became aware of “how to get involved,” which he did not previously notice. Thereby, a new small category emerged from the middle category “how to get involved” under the large category II.