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The purpose of this study is to define the effects of regular swimming exercise on the physical composition, physical strength, and blood lip-ids of middle-aged women. The subjects of this study are a total of 24 middle-aged women in the swimming group and the control group, with 12 women for each group. The swimming group performed swimming exercise for 60 min every time for 3 times a week, for a total of 12 weeks. For data processing, SPSS 21.0 statistics program was used to calculate the mean and standard deviation. For the difference verifica-tion on the change in mean for each group and between the groups, paired and independent t-tests were respectively used. As a result, for physical composition, the body fat rate decreased in the swimming group. Moreover, the difference verification result showed a statistical-ly significant difference between the groups. For physical strength, the difference verification result for each group showed that the swimming group had a statistically significant difference in flexibility and cardio-vascular endurance. Moreover, the difference verification result be-tween the groups showed a statistically significant difference only for flexibility. For blood lipids, as a result of the difference verification for each group, T-C and TG showed a significant decrease, and HDL-C, a significant increase. However, in the difference verification result be-tween the groups, only T-C and TG showed a statistically significant dif-ference. With these results, it is considered that regular swimming ex-ercise is effective for improving the physical composition, physical strength, and blood lipids of middle-aged women.