The present invention relates to a leather sofa, wherein one end of the first belt 31 is fixed to a portion where the leather cushion 10 and the backrest 15 come into contact with each other, and the buckle 33 is mounted on the other end of the first belt 31. One end of the second belt 35 is mounted on the auxiliary cushion 20 seated on the leather cushion 10, and the tongue 37 is mounted on the other end of the second belt 35, thereby providing the buckle ( 33 is coupled to the tongue 37, it is characterized in that the auxiliary cushion 20 is seated so as not to flow down from the leather cushion (10).
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