Aim: This study investigated the lifestyle convenience of Insulin therapy for adult women patients with type 1 diabetes. Methods: Participants were type 1 diabetes adult women patients who switched from multiple daily injection (MDI) therapy to Continuous Subcutaneous Insulin Infusion (CSII) therapy. We conducted semi-structured interviews with participants. To analyze, we referenced the classification table of Hamada’s study comparing the usefulness of both the NovoPen? and CSII. Semi-structured interviews were conducted with the research subjects. The questions focused mainly on diabetes management, instrument operation, everyday life, and social, psychological and lifestyle convenience aspects during MDI and CSII. Results: Research subjects were 4 women patients with type 1 diabetes. The average age was 35.3 ± 6.24 (SE) years old. Participants were undergoing MDI therapy; however, in the middle, they switched to CSII therapy. CSII therapy is convenient in terms of diabetes management, social and psychological. MDI therapy is convenient in terms of instrument operation and daily life. Compared to MDI therapy, CSII therapy is less convenient in terms of instrument operation and everyday life. However, since CSII therapy has more stable HbA1c and blood glucose levels compared to MDI therapy, it is more convenient in terms of social and psychological aspects and reduces those burdens. About economy CSII therapy, patients paid about 5000 yen more per month compared to MDI therapy. Conclusion: It is believed that patients prioritize therapeutic effects, and choose CSII, which is stable in psychological and social aspects, even though it is inconvenient with life.