This paper present a rare case of a Type III Monteggia equivalent fracture with an ipsilateral distal radial epiphyseal (Salter-Harris type II) and an ulnar metaphyseal fracture in a child. An 8-year-old boy sustained a closed bipolar fracture of his forearm after a fall from a height. The closed reduction was unsuccessful. Therefore, an open reduction and plate fixation was performed for a diaphyseal fracture of the ulna, and the unstable radial fractures and the distal ulnar metaphyseal fracture were treated with a closed reduction and internal fixation using Kirschner wires (K-wires). Two years after surgery, the joint motion including the forearm, wrist and elbow were completely normal. Radiologically, the bone was well united without any residual deformity.