The occurrence of apparent legal actions leads to threats against the principles of legal certainty and the security of legal transactions. Th e author distinguishes usual appearance, which implies that the parties engaged in a legal activity do not intend to have any legal eff ect, and qualifi ed appearance, which refers to cases of the apparent conclusion of an agreement by the parties in order to hide another agreement. Th e author has distinguished the eff ects of each type of appearance in the employment relationship. In the absence of legal regulations of the defects of the declaration of intent on labour law, the author answers the question about the scope and method of use of civil law to regulate the appearance in labour relations relating to Art. 300 of the Labour Code taking into account the specifi c nature of the employment relationship. She assesses the legal guarantees in labour relations of the implementation of the constitutional principle of the rule of law i.e. the creation of legal standards with regard to safety and the security situation of the parties of the labour relationship as well as the protection of the interests of third parties. Th e article is an analysis of appearance in labour relations, taking into account the rich jurisprudence of the Supreme Court and the literature on the subject.