Objective: The purpose of this study is to examine the outcome of laparoscopic sleeve gastrectomy (LSG) for morbid obesity. Method: We examined the treatment results of patients who underwent SLG at our hospital. The items to be examined included postoperative weight changes and obesity-related complications (type 2 diabetes, hypertension, dyslipidemia). Results: The subjects were 33 morbidly obese patients (8 males and 25 females) who underwent LSG from August 2014 to February 2020. The mean age at the first visit was 44.0 ± 3.5 years (20-65 years), the mean weight was 107.9 ± 7.6 kg (85-142 kg), and the mean BMI was 41.5 ± 3.3 kg/m² (35.3-52.6 kg/m²). No postoperative complications were observed in all cases. The weight reduction effect in the first year after surgery was 34.8 ± 10.2 kg (11.2-53.3 kg), the mean BMI reduction was 13.9 ± 3.7 kg/m ² (4.5-20.0 kg/m ²), and the mean percentage of excess weight loss was 84.8 ± 20.7% (38.9-143.0%). Metabolic disease remission rates were 93.3% in type 2 diabetes, 65.2% in hypertension, and 60.0% in dyslipidemia. Conclusion: The results of LSG were as good as those of other institutions in terms of weight reduction and improvement of obesity-related diseases.