Background: Informal care has long played an essential role in the long-term care of older people worldwide. However, particularly in Japan, where aging is highly developed, the lack of formal care often results in greater demand and pressure for informal care. Therefore, it is necessary to verify psychological factors that influence older Japanese people’s preferences for informal care. Furthermore, in doing so, bringing references to the field of long-term care in other countries where aging is developing. Aim: This study aimed to verify the psychological factors influencing the preferences for informal care among older Japanese people. Method: In this quantitative cross-sectional study, a total of 300 respondents were recruited to answer questionnaires to elicit their preferences for informal care. The data was analyzed by factor analysis and multiple regression analyses. Results: As hypothesized, some psychological factors have also been shown to significantly influence the preferences for older Japanese people towards informal care. Specifically, those Japanese people who had higher awareness of family care, higher psychological indebtedness and higher loneliness were observed to prefer informal care. Conclusion: The Andersen Behavioral Model is appropriate as a theoretical basis for studying older people’s preferences for informal care. However, psychological factors should also be considered to impact older people’s preferences for informal care.
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