176 Background: Mastectomy is a life-saving management but can cause significant adverse reactions. So, breast reconstruction is a concern in recovery after mastectomy. We report our experience with immediate breast reconstruction using implant or tissue expander, which confirmed the oncologic safety and high patients’ satisfaction. Methods: This study is a retrospective review of all patients who underwent reconstruction with implant or tissue expander immediately after mastectomy. Seventy-seven patients underwent breast reconstruction at a general hospital breast cancer center from January of 2008 to December of 2010 and 14 patients were excluded because of follow-up loss. Therefore 63 patients were included. To access patient’s satisfaction, questionnaire was sent to all patients. Results: Mean age of the patients is 44.1 years. ( range: 29-64) After median follow-up periods of 22.4 months, there was 1 case of locoregional recurrence, 1 case of distant metastasis and overall breast cancer specific survival was 100%. Overall major complication rate was 11.1% (7 patients), such as nipple areolar complex (NAC) necrosis and implant removal. Among 10 patients who had NAC necrosis, 6 patients improved after observation, and 4 patients performed NAC excision. Three patients were removed their implant due to severe infection, leakage or dissatisfaction. There were 32 cases of total mastectomy, 12 cases of skin sparing mastectomy (SSM), 19 cases of NAC sparing mastectomy (NSM). According to the result of questionnaire, 84.1% was satisfied with generalized operational result, 77.8% with cosmetic result. Among 19 patients who had performed NSM, 89.5% was satisfied with general result, 84.2% with cosmetic result. Conclusions: Immediate breast reconstruction using implant after mastectomy is technically feasible and oncologically safe as well as relatively good patient’s satisfaction. But we need more long-term experience.