In the legislative process, on 7th July 2005 the Seym (the lower chamber of the Polish parliament) passed the Act on Lobbying Activities, which came into force on 7th March 2006. In the article the circumstances are analysed which brought about preparations of the above-mentioned bill in the Seym of the III and IV term as well as the as its legislative 'nature'. Next, the range of regulations contained in six chapters of the act is considered. The transparency principles of lobbying activities and the mechanisms which function in their realisation are analysed in detail. The same applies to rules which regulate the principles of professionally conducted lobbing activities, control over them and sanctions for their violations. Next, the catalogue of issues which may hinder application of the act and achieving anticipated objectives is set up. Since, as the author claims, the Act on Lobbing Activities constitutes a legislative experiment, then also its implementation will become an experiment in the scope of its application as well as in practical, public and political relations.