The article analyses the definitions of «rights institutions» and «Law Institute»,which take place in the scientific literature and in the legislation of Ukraine. It is allowed to offerdoctrinal author’s definition of the term «institution of investor protection», which helps toeliminate the gap in this area. The author of the peculiarities of the Institute of investorprotection, which includes interrelated substantive and procedural rules of law; restoring rightsand proactive (preventive) function of the protection of rights; the rule of law, prescribe themodes, forms, remedies, as well as a mechanism for their implementation; protection of rightsand legitimate interests of investors.