The number of Indonesian care staff working in hospitals and long-term care facilities caring for persons with dementia in Japan is increasing; however, there is no instrument available in the Indonesian language to assess their dementia care practice. This study aimed to translate the Person-centered Care Assessment Tool (P-CAT) and evaluate its psychometric properties in a sample of Indonesian care staff working in dementia care and long-term care facilities in Japan. This is a descriptive, methodological, and cross-sectional study. The P-CAT was translated into the Indonesian language. The draft was administered to Indonesian care staff (n = 218) working at long-term care facilities in Japan. Data were analysed using exploratory factor analysis (EFA), confirmatory factor analysis (CFA), known-group validity, internal consistency, and test-retest reliability. EFA showed three-factor and CFA of the three-factor indicated that the model had an acceptable fit (chi-squared statistics/degree of freedom = 1.78, comparative fit index = 0.94, root mean square error of approximation = 0.06) with a slightly different structure compared to the original P-CAT. Regarding known-group validity, the P-CAT total score was significantly higher for those who had training in dementia, who knew about person-centred care, and who showed satisfaction in the job. Internal consistency (Cronbach's α) of the total scale was 0.68 which is considered acceptable, and the test-retest reliability intraclass correlation coefficient was 0.61 which is considered moderate. The Indonesian P-CAT indicated sound validity and reliability to measure person-centred care among Indonesian care staff working in dementia care and long-term care facilities in Japan. The development of Indonesian P-CAT allows the evaluation of dementia care, promotes and further improves person-centred care for persons with dementia provided by Indonesian care staff working in long-term care facilities in Japan.