Work related musculoskeletal disorders (WMSDs) became a major problem since 2000 in shipbuilding industry. WMSDs are known to be resulted from awkward postures, high repetitive motions, excessive forces, mechanical stress and vibration. Korean government enacted a law to require companies to take measures to prevent musculoskeletal disorders at work. If there are more than 10 incidences of WMSDs or 5 incidences which are more than 10 percent of all workers in a company, this law requires a company to implement an ergonomics program. A few large companies in shipbuilding industry have already implemented or are in the process of implementing an ergonomics program. This paper presents a case study of an implementation of an ergonomics program in a Korean shipbuilding company. We audited the process of the ergonomics program in this shipbuilding company four times for 3 years. Based on the findings, this paper presents effects and problems of an ergonomics program and improvement measures of them. These findings will help companies which want to implement an ergonomics program in the future.