## I II Trends of lifetime migration

The present survey contains questions on the careers of individuals so we are able to grasp the locations of his/her residence at major events in life such as birth or marriage. Such information cannot be collected from national-level migration data sources such as Annual report on the internal migration in Japan derived from the basic resident registers and Population Census. Furthermore, the present survey added new questions on the total number of migrations in a respondent's life and all the names of prefectures in which the respondent has ever lived. Thus, the present dataset includes unique information that was not collected in the past. Here we briefly describe the survey results on the total number of migrations in a respondent's life, regions in which one has lived, and relationships between birthplace and present residence.

## 1 Average number of moves in a lifetime

Table 6 shows the average number of migrations in a lifetime by sex, age, present profession, region of present residence, and birth region. For all respondents, the average number of migrations is 3.12. The average is slightly higher in males (3.21) than in females (3.03). As for relationships with age, the average number of migrations simply increases as age rises until 40 for both males and females. After the age of 40, however, it displays a complicated trend. If age specific rates of migration do not differ by birth cohort, the number of migrations should simply increase as age rises. This means that in birth cohorts now aged 40 years or above, age specific migration rates have differed from cohort to cohort. A large number of migrations among respondents in their 50s seems to be affected by the fact that these people (born approximately between 1937-46) encountered a period of high economic development when they were in their 20s and thus migrated actively.

Results by profession show that the average number of migrations is 4.07 for those engaged in “professional, manager, clerical, or related work,” but is only 1.46 for “agriculture, forestry, fisheries, or related work.” Such differences by profession seem to be produced not only by differences in opportunities for job change or transfer, but also by different migration experiences with educational advances and labor market entry between professions.

Data by region of the present residence indicate that the most migratory respondents are those living in the Tokyo region. Their average number of migrations is 3.61 for males and 3.38 for females. Low averages are observed among residents of Northern Kanto, Tohoku, Chubu-Hokuriku, and the Nagoya region. Except for Hokkaido, migration experience in Japan shows a West-High/East-Low tendency. On the other hand, data by region of birthplace clarify that the average number in the Tokyo region, alongside the Nagoya region, is lowest. This means that the high average among present residents in the Tokyo region is produced by those who were born outside the Tokyo region and currently live there. These respondents have experienced a large number of migrations. Those born in the Tokyo region, on the other hand, have migrated less. Birthplaces displaying a high level of migration are Hokkaido, Tohoku, Chugoku, Shikoku, and Kyushu-Okinawa. This seems to be caused by the fact that those born in these regions tend to migrate to other regions (mainly the metropolitan areas) at the time of educational advances and entry into labor market.