无效行政行为是指已经成立了的行政行为但由于重大、明显违法而不具有公定力，从而自始、当然、确定不发生法律效力的行政行为。
最后，分析假象行政行为、可撤销行政行为与无效行政行为的关系。
Last, the relations are analyzed between false administrative behavior, cancelable administrative behavior and invalid administrative behavior.
无效行政行为因具有重大的明显的违法情形，自始不发生任何法律效力。
Invalid administrative act has no legal validity from beginning to end because of its gross and evident illegalities.
无效行政行为主要是大陆法系国家和地区行政法上的概念、理论和制度。
On administrative law, the invalid administrative act is mainly a concept, theory and system in countries and areas of continental law family.
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