Abstract: A rack structure includes a bottom, a coupling member, and a side frame. The bottom has rod-shaped support members extending out from the circumference of the bottom. The coupling member has through holes for insertion of the support members. A distal end of each support member is provided with a stop block having an outer diameter greater than the through holes. The side frame has an accommodation room therein. One side of the side frame has an opening. The side frame has a pair of hook portions located at two sides of the opening and extending toward the accommodation room. The coupling member connected with the distal end of each support member is inserted through the opening into the accommodation room of the side frame. The hook portions of the side frame enable the coupling member to lean against the stop block of each support member tightly.