Until the 19th century, misdemeanours were treated as a part of the criminal law in a broader sense, while the legal science still doesn’t consider it to be a separate legal branch. The merits of the procedure regarding minors and misdemeanour offences are urgency and shortened duration. The purpose which is meant to be upheld is the education and formation of the minor’s persona. In national legal systems, the definition of underage person encompasses different age levels, which is justified, keeping in mind the different cultures, customs and national systems. In historical development, misdemeanours are developed under the frame of administrative law. The regulation of Misdemeanour law in heading twenty-nine is regulating the misdemeanour procedure against minors. The principle of purposefulness is the primary principle engaged regarding the leading of the misdemeanour offences against minors. The sanctions which the court adjudges to the minors after the completion of the misdemeanour procedure are: educational measures, protective measures and punishments. The Social Care Centre has great importance in the procedure against minors, as the body which is largely helping the court, as per the ascertaining of the facts deemed important for the procedure, as for the educational role regarding the minor. It is necessary to implement the international documents in the national legal system, which are above the law by their legal power. By doing so, the procedure toward minors is harmonized. While uniforming the court procedures, the practice of the European Court is of great help, for example, the case Maresti against Croatia, for a detailed explanation of the principle ne bis in idem.