Ginga observations have confirmed the extended hard X-ray component around Cyg X-3 which has been detected by EXOSAT. Scanning observations of Cyg X-3 show that this component extends up to 2° from Cyg X-3 along the Galactic plane. The surface brightness observed by Ginga is consistent with that observed by the EXOSAT ME. The ratio of the count rates in the 3-6 and 6-10 keV bands shows that the extended component has either a thermal bremsstrahlung spectrum with a temperature of 6±2 keV or a power-law spectrum with a photon index of 2.3±0.3. If this is associated with Cyg X-3, the X-ray luminosity in the 2-10 keV band is estimated to be about l × 1036 erg s-1.We discuss two alternative explanations for the origin of the X-ray halo: thermal emission from a hot gas or synchrotron radiation of the ultra-high-energy electrons which are expected to be produced along with ultra-high-energy γ-rays.