Although juvenile delinquency has been continually decreasing, property and traffic crimes have been increasing. The age of delinquents or adolescent criminals are getting younger, and the number of female involved in delinquency or crimes has been increasing. The most frequently researched topic has been factors of causal effects on juvenile delinquency and development of counseling programs for the delinquents. Other studies have been investigating descriptive data, analyzing differences by sex, or categorizing delinquency behaviors by type, and suggesting political alternatives for restoration of juvenile delinquency. There have been several academic issues on the conceptual definition of delinquency, shift in research topics, and research methods. There have been further discussions on the imminent values of making relevant policies based on the results of multi-disciplinary research, developing the preventive and therapeutic programs and career counseling programs, and working with the experts from local communities.