Support device for supporting a body, in particular a human body

A support device for supporting a body or part of a body, in particular a human body, comprising a support element (2) made of a deformable material and comprising a seat (3) and a peripheral side wall (4) projecting from one side of this seat top surface so as to delimit a recess (5) having a roof (6) and a peripheral side face (7), and a pneumatic element (9) comprising a base (10) and a plurality of inflatable cells (11) projecting from one side of the base and located next to one another in a grid pattern of lines and columns, the inflatable cells (11) engaging in the recess (5) and extending between the roof (6) of said recess and the base (10) of the pneumatic element (9);

• in which the peripheral side wall (4) of the support element (2) comprises at least one inward-projecting retaining bead (8) located at a distance from the roof (6) of the recess (5) such that the peripheral side face (7) of the recess (5) has at least one setback portion (7a), at least some of the inflatable cells (11a) that are adjacent to said retaining bead (8) being able, when inflated, to engage laterally between this retaining bead (8) and the roof (6) of the recess (5) and to hold the pneumatic element (9) along the periphery or the perimeter of this recess.