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There is a lack of validated instruments measuring motivation for physi-cal activity (RM4-FM) in the Finnish language. The study examined the translated RM4-FM instrument’s psychometric properties in a sample of healthy, older Finnish adults. RM4-FM was translated and linguistically validated adhering to published guidelines. 65–75-year olds (n=102), completed the RM4-FM, the physical activity acceptance questionnaire (PAAQ) and sociodemographic characteristics questionnaires elec-tronically. The RM4-FM was readministered one month after the initial assessment. RM4-FM translated well into Finnish. Motivation dimension scores were skewed towards high internal and low external motivation. A floor effect was confirmed in the external regulation dimension and a ceiling effect was confirmed in the identified regulation dimension. Con-firmatory factor analysis indicated inadequacy of the four-dimension model. Separate assessment of each of the four motivation dimensions with Exploratory factor analysis showed unidimensionality for all dimen-sions. Exploratory factor analysis provided a best-fit model of three fac-tors (influence of other people, intention of well-being and emotional aspect of motivation). Readministration of the instruments showed good test-retest reliability in all motivation dimensions. Female gender, higher education, and higher PAAQ score were associated with higher inter-nal motivation and lower external motivation scores. The Finnish ver-sion of the RM4-FM instrument provides valid and reliable scores in as-sessing motivation for physical activity in healthy, older Finnish adults. The score distributions suggested shortages in the scale when evaluat-ing internal motivation. The three-factor model of the RM4-FM provided more favorable structural validity compared to the original version.