The aim of this study is to evaluate the effects of agricultural activity on cognitive function, physical function, motivation, activity of daily living (ADL), self-efficacy and quality of life (QOL) of hospitalized elderly with dementia using multivariate statistical analysis. Elderly with dementia performed them for 2 months that replaced with agricultural activities once a week after they performed ordinary activities for 2 months. Ordinary and agricultural activities showed higher score than control condition. Two therapies are compared by principal component analysis (PCA), correlation analysis and multiple regression analysis (MRA). From the PCA analysis, motivation, muscular strength, walking ability, and mobility ability tended to improve during agricultural activities, but there was no significant difference in cognitive function, daily life, and behavioral disorders. In the correlation analysis, walking speed, walking time, timed up and go test (TUG), and grip strength showed a high score. MRA showed that improved physical function is improved during agricultural activities, but no significant improvement in cognitive function and ADL. Therefore, it was found that agricultural activities may be useful for improving physical functions. Long-term evaluation is needed for discussing the effects on cognitive functions and ADL.