This article explains the development of teaching punctuality in primary school. Punctuality refers to actions performed in a single moment. Before the Meiji era, the habit of punctuality spread only among the elite. However, during the Meiji era, punctuality began to be introduced into society. The Meiji government adopted the Western time system, such as minutes and seconds. The elderly had difficulty changing their habits to learn to be punctual. However, children may absorb new things quickly. Therefore, the government decided to teach punctuality as early as possible. Many changes occurred during the Meiji era. It was not only a question of punctuality but also of the education system. During the Edo period, there were no specific regulations on starting time. Even children studied together in the same room, no matter how old they were. Between 1871 and 1873 some Japanese together with the Minister of Education went to America and Europe to observe their educational systems. They also invited an American educator to teach. As a result, the education system had been radically changed. Since then, discipline has played an important role. Children now had to come to school 10 minutes before it started. They also did not allow them to enter class during free time. The classroom was where lessons were held. There was a waiting room where they could wait. Teachers gave signals to announce that children could enter or leave the classroom. There was a janitor announcing the time at school. The time was announced by drums, hammer blows, bells and hand bells. Punishments were also implemented during this period to inculcate time discipline among children, such as standing at attention and after school detention. The Minister of Education has also established the curricular timetable of primary schools, such as time for physical exercise between subjects, a short break, etc. Since then the awareness of the preciousness of time has increased. The children learned how important time is and the importance of punctuality. To make the children better understand punctuality, teachers highlighted personal stories. They told stories based on concrete models, instead of lecturing and explaining principles. There was an organization called Seikatsu Kaizen Domekai that was intended to promote punctuality. Designated June 10 as the day of the hour when they corrected the clocks of passersby and rang bells and gongs at midnight..