The article examines individual issues related to the definition of the subject of proof of abuse of procedural rights within the framework of arbitration, civil and administrative proceedings. Initially, a general description of legal facts related to the abuse of procedural rights is given, then individual specific cases of abuse of procedural rights are analyzed as elements of the subject of proof in the case. As a result, the author comes to the conclusion that legal facts of abuse of procedural rights are included in both the general and local subject of proof in the case.