Objective: The interest of minimally invasive cardiac surgery has been much increased. The aim of study was to analyze the surgical results of cardiac surgery using da Vinci^TM system in patients with mitral regurgitation (MR). Method: Between August 2007 and May 2009, a total of 71 patients underwent robotic cardiac surgery using the da Vinci surgical system for MR. Operation was performed by the right anterolatereal minithoracotomy via 4th intercostal space approach. Transthoracic aortic clamp and antegrade cadioplegic solution infusion were used for myocardial protection. Intra-operative transesophageal echocardiography was performed in all cases. Results: The mean age of the patients was 45.6 (range: 25–71) years. Mitral valve repair was possible in all patients. Concomitant procedures were ASD or PFO closure (n=9), tricuspid annuloplasty (n=10), and Maze procedures (n=19). The mean cardiopulmonary bypass time was 196.1짹54.1 minutes and the aortic cross clamp time was 123.6짹36.9 minutes. Ring annuloplasty was performed in 70 patients (98.6%) in whom Cosgrove ring was used in 65 patients and Physio ring in 5 patients. Techniques of mitral valve repair were quadrangular resection (n=7), triangular resection (n=25), new chordae formation (n=29), commissural repair (n=19), and so on. There was one reoperation due to the recurrent MR. Conclusions: The present study showed that minimally invasive mitral valve surgery using da Vinci surgical system was effective treatment option and variable techniques of mitral valve repair could be applied effectively.