The purpose of the article is to define the tasks and functions of a lawyer in the process of his/her representation within the administrative procedure. The study was made using such methods as analysis, synthesis, comparison. It is concluded that a lawyer as a representative in administrative proceedings is a procedural person who performs legal actions within certain tasks, powers granted to him on behalf and in the interests of the person who entered into a contract with him to provide legal assistance to protect rights, freedoms and legitimate interests of the person he represents. Emphasis is placed on the peculiarities of the lawyer's activity in administrative proceedings and research of his functions and tasks in administrative proceedings. It has been noted that the list of lawyer's functions is not exhaustive. Representative and advisory functions are only the basis of a lawyer's activity in the field of administrative proceedings. Ancillary functions in the activities of a lawyer in administrative proceedings can be defined as functions such as preventive, restorative and protective ones. The author has concluded that a lawyer as a representative in administrative proceedings is a procedural person who performs legal actions within the powers granted to him on behalf and in the interests of the person who entered into a contract with him to provide legal assistance to protect the rights, freedoms and legitimate interests of the person. which he represents. The term «lawyer's task in administrative proceedings» should be defined as well-defined, clearly planned scope of work performed by a lawyer in administrative proceedings to protect, represent interests or provide other legal assistance to a client necessary to resolve an administrative case. For the professional solution of tasks in administrative proceedings the lawyer is endowed with the corresponding functions which are the basic directions of activity which are realized by it for protection, representation and rendering of other legal help to the client in administrative case.