An assembling type sectional shelf structure is disclosed. A plurality of shelves can be easily assembled to a support member so that various things can be arranged and stored on each shelf. The assembling type sectional shelf structure comprises a plurality of rectangular prism shaped shelves which have upper sides opened; assembling members which are assembled at the corner portions of the opposite sides of the shelves and have triangle shaped through holes at inner sides; fixing members which have support member holes at center portions, guide ribs formed at both sides of the inner walls, and engaging protrusions formed at side surfaces and are inserted into the through holes of the assembling members; and support members which include guide grooves which are engaged with the guide ribs and guide the movements of the fixing members when the fixing members are inserted into the outer sides of the same, with engaging grooves engaged with the engaging protrusions of the fixing members being formed at one side surface of the same.