The purpose of this study was to determine the cause of the child committed the crime of murder. This resarch used a normative metod, with the premire law material that was the rule and second law material such as the literature from reseach, book, articles and legal opinions. Not only that, I also conduct question and answer session with the judge handling the trial of children who are often children. in cases of murder committed by a child, the child judges must consider the advice of the supervising social (Bapas), so that the defendant receive guidance and mentoring pisikologis,children who committed the crime of murder is always supervised by a correctional counselor, to get the right dak obligations as children in general, so that later the child did not commit a crime again.