This study aims to examine teachers' involvement with the influence of five-year-old children on the four-year-old children for their growth. This study was conducted as follows: (1) Four-year-old children were given chances to get involved with five-year-old children: (2) Records were kept when they got involved with five-year-old children and after it happened: (3) From the records, teacher's involvements were investigated: (4) whether the teacher's involvements made most use of influence of five-year-old children was examined. This study reveals following: (1) Teachers' four-year-old children got involved with five-year-old children: (2) They intentionally said what they want to be noticed: (3) They sympathized with the children who willingly played under the influence of five-year-old children: (4) They acted as go-between for four-year-old children and five-year-old children in order for four-year-old children to gain recognition and to have confidence in themselves.