The average number of members per private household in Japan amounted to **** people as of 2023. The number of household members indicated a downward trend in recent decades, mainly due to an increase in nuclear families and one-person households.

Japan's total number of private households amounted to around **** million in 2020. Even though the number of Japanese households has experienced a consistent increase since the initiation of the Population Census, the number of household members has decreased, indicating the growing number of private one-person and nuclear-family households.