Purpose: This study was conducted to determine the effects of middle-aged women's social support, self-efficacy, and perceived health status on aging anxiety. Methods: Research subjects were 210 middle-aged women between 40 - 60 years living in G-city. Data were collected from July $21^{st}$ 2014 to August $8^{th}$ using a structured questionnaire and analyzed using t-test, One way ANOVA, and multiple regression analysis using the SPSS/WIN 21.0 program. Results: Aging anxiety showed statistically significant differences in religion (t=2.44, p=.015), satisfaction with married life (F=4.39, p=.014), type of leisure activity (F=8.09, p<.001), and number of friends (F=3.23, p=.024). Aging anxiety showed correlation with social support (r=-.21, p=.003), self-efficacy (r=-.46, p<.001), and perceived health status (r=-.33, p<.001). Factors affecting aging anxiety were self-efficacy (${\beta}=-.33$, p<.001), perceived health status (${\beta}=-.23$, p<.001), leisure activity type (${\beta}=-.16$, p=.010), and religious affiliation (${\beta}=-.17$, p=.038). The predictive power of these variables was 25% (F=18.63, p<.001). Conclusion: Nursing intervention strategies for improving self-efficacy, perceived health status, and leisure activity are required to relieve aging anxiety of middle-aged women.