Abstract: The present invention relates to an armchair effective to be transformed into a bed, comprising a plurality of opened box structures, coupled telescopically to one another and unthreadable from one another in such a way as to provide a resting plane having a length like that of a conventional bed. The level difference occurring in the box structures forming said resting plane or surface is compensated for by using cushions having suitably differentiated heights. To the fixed base structure, furthermore, are coupled a backrest effective to assume two stable positions of different slant, and at least a vertical wall provided with a basculable or tiltable arm and including an unthreadable table arranged to be rested on said tilted arm.