The article is devoted to the topical problems of theory and practice of appraisal of documentary heritage objects value in scientific libraries, archives, museums taking into consideration functional and stock specifics of these institutions. Its goals and tasks, principles and axiological criteria are described. It is shown that the main goal of such appraisal is determining the place of documentary heritage objects as the objects of the appraisal in the system of cultural values of modern society, establishing the belonging of these objects to cultural heritage objects of world, national, regional, local significance. Appraisal of documentary heritage objects is analyzed as one of important areas of scientific and administrative activities which to a large extent ensures the functioning, improvement of information potential and accordingly the image of the library, archives, museum. The Ukrainian experience of the recent decades is highlighted in many aspects, namely: regulation, organization and appraising documentary heritage objects at the state, interdepartmental and departmental levels, at the level of the profile institution fund-holder. The features of the appraisal, the objects of which are archival heritage objects and book heritage objects, are revealed. It is emphasized that the appraisal of value of the existing funds and collections of documentary heritage objects is the basis for the development and implementation of modern individual concepts and integrative projects for libraries, archives and museums, which provides for the coexistence and interrelation of material expositions and various forms of virtual information.