The following study encompasses the analysis of a range of psychological opinions extracted from marriage invalidation cases, which were proceeded by the Bishop’s Court in the Diocese of Toruń. The article presents theoretical assumptions which are of legal nature and refer to personality disorders in psychological terms in the context of valid matrimonial consent. The theoretical part of the study refers to the institution of the matrimonial consent, which is the causative force of marriage and presents its invalidity in both subjective and objective aspect on the grounds of personality disorders. The analysis conducted in the research part presents various personality disorders contributing to the invalidation of marriage, distinguishing between the etiology of particular disorders and the dysfunctionality areas indicated by the appointed court experts in family and marital life.