Recently, the needs of body movement support based on robotic technology arise for both Activities of Daily Living (ADL) and rehabilitation therapy. In both cases, the device is required to be compact and lightweight often in a wearable fashion, to effectively support the wearer’s movement without hindering the limb’s motion. In this paper, we propose a pronosupination support device driven by an elastic strip which provides a compact and user-friendly design, thanks to its effective power transmission. In this paper, the concept design, prototype implementation, and preliminary evaluation are reported.