PURPOSE: The purpose of this study was to investigate perceptions of adequacy and job performance of the nurse assistants' nursing job as evaluated by registered nurses and nurse assistants in geriatric hospitals, and by caregivers from the same hospitals. METHODS: Participants included 62 registered nurses, 57 nurse assistants, and 64 patient caregivers who completed a measurement scale on the job of nurse assistants. Data collection was conducted from October to December, 2015. Data were analyzed using descriptive statistics and one-way ANOVA by IBM SPSS/WIN program version 21.0. RESULTS: There were significant differences by items in perception of adequacy of nurse assistants' nursing job of among the three groups. There was also a significant difference in perception of the nurse assistants' job performance among the three groups. CONCLUSION: For nurse assistants in geriatric hospitals, the Ministry of Health and Welfare needs to develop an appropriate job practice guideline. In addition, there should be periodic courses of retraining and continuing education for nurse assistants.