Single sofa bed

The utility model relates to a single sofa bed, the guide arm did not have limit function at horizontal pole inside slip measured time during it had mainly solved prior art, and the slip in -process breaks away from easily to when folding into the sofa, hand seat does not have a side direction holding power, include support, cushion, back, hold up hand rack, handlebar rest, hold up the horizontal slip of holding up hand rack between hand rack and the support through guide arm and the realization of horizontal pole sliding connection, the one end of being connected with the guide arm on the horizontal pole is located the fixed stopper that is provided with in inboard bottom surface, the medial surface and the upper surface of stopper are provided with first recess and second recess respectively, the leader casing is located the stopper outside and is slided, the free end of guide arm has set firmly the locating piece, the lateral surface of locating piece outwards is equipped with the lug, when outer end is ou