Problem statement. Ethical and legal requirements when concluding an agreement on legal aid assistance by a lawyer is a relevant area of research in legal science, which is of great methodological importance in the practice of the lawyer. The purpose of the article is to formulate a definition of the concept of "ethical and legal requirements when concluding an agreement on the provision of professional legal assistance by a lawyer" and to substantiate proposals for improvement of the current legislation of Ukraine and the Rules of Attorneys' Ethics. The methods used are: dialectical – for research TION process in the development of the problem of moral evaluation of the case when concluding a contract for legal aid by a lawyer; hermeneutic, which ensured the establishment of the limits of the interpretation of the concept; analysis – allowed to highlight the state of the scientific problem; formal-logical, statistical and documentary analysis – for the analysis of the content of legislation and other normative legal acts. Results. The origins of the ethical problem of moral evaluation of the case when taking a warrant by a lawyer are investigated, the issues of ethics of a lawyer's warrant for a non-prospective case are discussed, and the relation between the principle of integrity and attorney's fees in the context of the ethics of contracting; the existence of a moral aspect in the provision of legal assistance by a lawyer on the request of the Center for Secondary Legal Aid; Amendments to the Laws of Ukraine "On Advocacy and legal activity", "On Free Legal Aid" and the Rules of Attorney Ethics have been proposed. Conclusions. Proved that the universal Ethical criteria in the choice of cases a lawyer have not been formed. The "ethical and legal requirements for the conclusion of a contract for the provision of professional legal assistance by a lawyer" should mean "the set of legal and moral rules that are brought to the lawyer's activity at the stage of acquaintance with the case (legal situation) of the principal, governing the assessment of requirements and circumstances, which facilitate or impede the conclusion or refusal of a contract for the provision of professional legal assistance, and at the same time act as a guarantee of respect for the legitimate interests of the persons seeking this assistance, who have sought this assistance and the guarantee of the provision of qualified professional legal assistance by the lawyers. "It is proposed to supplement the Law of Ethics with the new principle of "caution (caution)"of the lawyer in the choice of the case at the stage of deciding on the conclusion of the legal aid agreement.