The article includes a study on the specificity of justice in a rule of law. The author aims to elucidate the purpose of justice in a democratic society and to identify the functions that the judicial power performs in order to achieve its purpose. As a result, it is concluded that the only function of the judiciary as a branch of the public power is the legal protection of human rights and freedoms, and the form of realization of the judicial power is the act of justice exercised through administrative, criminal, civil jurisdiction.