This Thesis is focused on the criminal trial, which is the most important part of the criminal proceeding. The purpose of the criminal proceeding, which is to investigate the perpetrator of the crime and his just punishment, is fulfilled during the criminal trial. The object of this Thesis is to present the process of the criminal trial and to particularly elaborate about the legal regulation of those juridical institutes, which may appear problematic or not fully clear. The aim is also to present the critical view on some juridical institutes contained in the legislation or to those which cause difficulties in practice together with the outline of their future regulation or de lege ferenda view or how the foreign regulation deals with them...