The invention relates to a safety device for an auxiliary wheelchair element, said auxiliary element being of the type used to convert a wheelchair into a chair in the form of a tricycle or similar. The device comprises a frame that is connected to the auxiliary element, said frame being formed by bars and two segments with different inclinations. The bars are connected by means for protecting and means for covering the lower limbs and the soles of the feet of a disabled person using a wheelchair with such an auxiliary element, as well as covering and protecting the wheelchair against possible irregularities and/or obstacles on the ground, and additionally ensuring that the auxiliary wheelchair element rests on the ground in the upright position when not in use.
