Sudden Cardiac Arrest(SCA), a true medical emergency, signifies the cession of the heartbeat and breathing, and loss of consciousness. As a global health problem, more than 25,000 persons suffer SCA each year in South Korea. Since the chance of survival from SCA decreases by 7% to 10% each minute after unconsciousness, high survival rates are typically only found when the time from collapse to defibrillation is short. The use of Automated External Defibrillator(AED), which deliver an electrical shock to victims of SCA, has contributed to increased survival rates of SCA victims. The increased number of accessible AEDs in public settings, including ariports, shopping malls, schools, and sport arenas has led to significant increases in SCA survival rates. In the sport setting, many SCA cases have occurred among professional, collegiate, and recreational athletes, and teenagers with otherwise healthy hearts. SCA cases have occurred at sport venues such as health/fitness clubs, aquatic facilities, sport stadia/arenas, and golf courses. Health/fitness facilities, in particular, have been recognized as higher risk locations that may benefit from the implementation of AEDs. To address SCA issues in South Korea, the government of South Korea amended the Emergency Medical Service Act in 2008. During this revision, several sub-paragraphs regading AED implementation were inserted. In the 2011 revision, laws related the Good Samaritan Act (Article 5-2 and 63 of the Emergency Medical Service Act) states that even though an AED is a medical device, it can be used by trained laypersons in a medical emergency. Currently, however, legislation and guidelines do not exist in a medical emergency mandating or recommending the use of AEDs in health/fitness clubs. The purpose of this study was to examine current AED legislations in South Korea and United States. Regulations and guidelines regarding health/fitness facilities in United States, also, was examined. Moreover, current implementation of AED in South Korean health/fitness facilities and manager s relevant legal knowledge and certifications (i.e., CPR, AED) were investigated to understand current status of AED implementation. The results of this study suggest the low level of AED implementation in health/fitness facilities in South Korea and the low level of manager s knowledge regarding relevant AED laws, resulting primarily from a lack of exactly related AED legislation to health/fitness facilities. Also, staff certification and training of CPR/AED and protection from liability are other considerable issues. The findings contribute to the body of knowledge of AED implementation in South Korean health/fitness facility specifically. It may contribute to future enactment of additional AED regulatory laws for sport venues in South Korea.