A device for supporting a person in a sitting position has a substantially horizontally extending supporting element placeable on a supporting surface substantially at a level of a person's pelvis when the person is in a sitting position, and two substantially vertically extending elements each having a lower end connected with the horizontally extending supporting element and an upper end extendable to an area of person's armpits so that the upper ends of the substantially vertically extending elements are placeable under the person's armpits.