We specify (young) migration factors from the anonymous survey of Sanyo-Onoda City in 5 years (2018-2023). The analysis is based on machine learning and shapley value analysis. The inflow factor candidates are “Relocation: Relative are nearby”, “We have a owned house.”, “Relocation: Convenient transportation for commuting to work and school, etc.”, “Relocation: We have land or a house.”, “Relocation: There is a place of employment (workplace) .”, and “Relocation: Good living/housing environment ”. Whereas, as the outflow factor candidate is “Relocation” with other reasons.