The subject of the study is the exception to the principle of discontinuation of works of the Polish parliament issue. The initial point of reference for further discussion is the state ment that the principle despite its benefits has also disadvantages which justify admis- sibility to formulate exceptions thereto. Then the author indicates its legal nature which has an effect on possible determination thereof. The exceptions to the discontinuation rule in legislation and parliamentary regulations were further analysed. Analyses car- ried out have led to the conclusion that the discontinuation of works of the Polish par- liament has the nature of the constitutional principle and exceptions thereto may be es- tablished only by an express decision of the legislator.