The invention mainly concerns a raising device (9) intended to be attached to a transport system (3) comprising at least two main wheels (1) to be raised, the two main wheels being pivotably connected to the transport system, about an axis (X), and two secondary wheels (7). The raising device (9) comprises at least one foot (11) designed for the switching of the raising device (9) from a rest position, in which the at least one foot (11) is free of any contact with the ground and the main wheels (1) to be raised are in contact with the ground, to a use position in which the at least one foot (11) is in contact with the ground and the main wheels (1) to be raised are free of any contact with the ground. The at least one foot (11) extends from a first end (13a) configured to be attached to the transport system (3) to a second end (13b) configured to be in contact with the ground when the raising device (9) is in the use position. The second end (13b) of the at least one foot (11) comprises at least one caster, called the first caster (29a), designed to be in contact with the ground and to allow a movement of the transport system (3) when the raising device (9) is in the use position. The invention also concerns an associated transport system (3).L'invention concerne principalement un dispositif de surélévation (9) destiné à être fixé à un système de transport (3) comprenant au moins deux roues principales (1) à surélever, les deux roues principales étant en liaison pivot avec le système de transport, autour d'un axe (X), et deux roues secondaires (7), le dispositif de surélévation (9) comprend au moins un pied (11) conçu pour le passage du dispositif de surélévation (9) d'une position de repos, dans laquelle le au moins un pied (11) est libre de tout contact avec le sol et les roues principales (1) à surélever sont en contact avec le sol, à une position d'utilisation dans laquelle le au moins un pied (11) est en contact avec le sol et les roues principales (1) à surél
