行政诉讼的参加人是指依法参加诉讼活动、享有诉讼权利、承担诉讼义务的人。主要是指诉讼当事人及其代理人。狭义的诉讼当事人包括原告和被告 ;广义的诉讼当事人包括原告、被告和第三人。在《若干解释》中 ,当事人的含义不统一 ,有的地方指原告和被告 ,有的地方还包括第三人。 Participants in administrative litigation refer to those who participate in litigation activities according to law, have the right to litigation, and undertake litigation obligations. Mainly refers to the litigants and their agents. Narrow litigants include plaintiffs and defendants; plain litigants include plaintiffs, defendants and third parties. In “several interpretations”, the meanings of the parties are not uniform, some refer to the plaintiffs and defendants, and others include third parties.