This research is a field research aimed to know effects of service quality that include alertness, reliability, guarantee, empathy, and physical evidence on member satisfaction. The objects of the research were KJKS BMT Artha Sejahtera Rotowijayan Yogyakarta located in Rotowijayan No. 15 Kadipaten, Kraton, Kota Yogyakarta 55132. Meanwhile, the subjects of the research were 1300 members of KJKS BMT Artha Sejahtera Rotowijayan Yogyakarta. Simple random sampling, collection of sample members from random populations regardless of the strata existed in the population, was used in this research. The sample of the research was done using slovin formula resulted in 92, 85 after the calculation, but it was made into 100 respondents. The data analysis used in the research were validity test, reliability test, multiple regression analysis, coefficient of determination (R2), F test, and t test. The findings of the research indicate that partially, reliability variable (0, 246) > 0, 05 and guarantee ( 0, 193) > 0,05 have no significant effect on member satisfaction, while alertness variable (0,000) < 0, 05, empathy (0, 011) < 0, 05 and physical evidence (0, 020 < 0, 05) have significant effect on member satisfaction. Simultaneously, service quality consisting of alertness, reliability, guarantee, empathy, and physical evidence significantly gives effect on member satisfaction with F value of 18.732 and its significance (0, 000) < 0, 05. The alertness variable with its significance (0, 000) < 0, 05 is the most influencing variable toward the member satisfaction of KJKS BMT Artha Sejahtera Rotowijayan Yogyakarta