A sofa bed including a support structure configured to be placed on the floor, a main seat base arranged on the support structure, a front foldable leg rest fixed to the structure by a first articulation, and a cushioned flexible body that covers the main base and the leg rest is disclosed herein. The first articulation includes parallel mechanisms configured to provide a movement on a vertical plane with a combined movement of folding and a forward motion of the leg rest, the leg rest includes at least one lower leg, the cushioned flexible body includes machined parts and an upper layer with a greater elasticity than the rest of the cushioned body in an area that coincides with the first articulation. The sofa bed further includes foldable support elements located under the cushioned body in an area coinciding with the at least one machined part.