The issue of the rule of law as a criterion for the action of public administration bodies has not yet been the subject of wider doctrinal reflection. The reason for this state of affairs is probably the rather sparing reference by public administration bodies to the rule of law as a basis for their decisions. Meanwhile, the obligation imposed on the authorities in Article 7 of the Code of Administrative Procedure should be treated as one of their fundamental duties in ongoing administrative proceedings. The present study focuses on signalling only some of the problems related to the notion of the rule of law on the grounds of general administrative procedure, indicating the ambiguity of this phrase and the related various understandings of it. The conclusions should be regarded as an invitation to discuss this undoubtedly complex issue.