A sofa can be knock-downed without a tool. The sofa includes left and right armrests, a front frame, a seating and a back. The sofa is provided with stowage compartments, each of which is joined by a bolt hole plate located on the frame construction with a bolt connecting medium, and serving as sofa stabilizers are four sofa legs which are placed on at the bottom of the left and right arm frame construction of the sofa.