This article provides an analysis of selected problems regarding the mechanism for con- vening sessions of the Sejm by its Marshal. The author criticizes the adopted legal solu- tions, first of all paying attention to the excessive strengthening of the role of the chair- man of the first chamber of parliament in this respect. In his opinion, doubts must be raised by the fact that under the regulations, the right to convene meetings of the Sejm has got only the Marshal, whereas such entities such like parliamentary factions, as well as the President and the government, are formally deprived of it. In addition, he also shows the dilemmas that may arise in the course of applying those provisions in systemic practice. M. in here, he indicates the problem of setting dates of a sitting of the Sejm, in- viting guests and the situation when a sitting cannot be convened for objective reasons.