1. Migration by marriage into families in 7 communities comprising the eastern part of Upper Ina District, Nagano Prefecture was studied. In the average for 6 villages, matrimonial immigration from outside into the village covered 30% of the married couple. The rest was the marriage within each village. 2. Marriage circle was found somewhat larger for lower, more level localities than typical highland villages. Definite relation exists between the facilities of communication and transportation and the size of the marriage circle. More urbanized places, namely, showed so much larger marriage circles. 3. Frequency of consanguineous marriage was shown higher in villages with narrower marriage circles. Marriage circle for consanguineous marriages was found smaller than that for non-consanguineous ones. Villages with higher consanguineous marriage circle also possess parallelly higher non-consanguineous marriage circle. 4. Flow in the matrimonial migration was shown directed primarily from less developed to more developed parts and secondarily from poorer to richer localities.