This study aimed at understanding the status of service quality in elderly residential agencies, as well as examining the correlates of service quality. Data were collected using self-administered questionnaire form 161 workers and 465 elders in the agencies. Statistical procedure used in this study included descriptive statistics, Pearson's correlation, t-test, one-way ANOVA and multiple regression analysis. The major findings of this study were as follows: 1. The differences between expected service and perceived were significant, which means the services received were not as good as what were expected. 2. There were significant differences between consumer expectation and management perception; and the management perception scores were higher than consumer expectation scores. 3. There were significant differences between management perception and service quality specification; service quality specifications and service delivery; service delivery and external communications. 4. The bivariate analyses found the following: 1. The number of social worker, the ratio of social worker to elders, the years of elderly agency, the quality of provided service and the quantity of professional programs were significant correlates of service quality. II. The social work competence and the social work commitment were significant correlates of perception gap. 5. The independent variables explained 5.6% of the variance in the service quality. The number of social worker and the quality of professional programs were significant correlates of service quality. Base on these findings, this study proposed some recommendations for the elderly residential agencies to promote the service quality.