The present invention relates to a non-automated apparatus for manipulating and reducing closed fractures of the ulna and radius at the level of the wrist in children and adults, which consists of a bar (1) designed to be able to position the fractured limb on the bar, the other nine parts of the apparatus being custom assembled according to the measurement of the forearm or writ to be manipulated, enabling a single person to reduce the fracture using three phases or movements of the device. The design and materials from which the apparatus is made allow the mentioned fractures to be reduced and safety stops are provided to prevent any harm to the patient. The manipulation or reduction of the fractures on which the present apparatus is used must preferably be handled by a doctor specialised in traumatology and orthopaedics.