抄録
From the post war era to the high economic growth period, there was a mass population movement from
rural areas to the cities. These migrants were believed to be the second or third son of agricultural families who
were seen as subordinate members to “Ie”. However, recently some empirical studies criticized the theory on
the movement of second or third son of agricultural families was an extremely simplified image. Besides, they
proved that practically a certain degree of eldest sons who are seen as the successors of “Ie” migrated to urban
city before WW2. Furthermore, they also found that the areas with higher education level faced more serious
problem in lack of successors.
This paper analyzed the process of higher educated eldest son migrated to urban city and formed
Japanese modern family in urban city without being a succession of “Ie” based on the case studies in Taki
Kyouyukai, a local associations of Sasayama city. According to this research, the formation of credential society
in high economic growth period lowered the mental pressure of Elder sons to migrate. The reason was the
shift of agricultural high school to industrial high school loosened the counterpart of Elder sons’ life course in
their home town. This paper studied how all these changes in high economic growth period affect the relation
between Eldest sons who had migrated to urban city and their “Ie” or the society of their hometown.
