A new ternary compound Ce(Au,Sb)2, with a homogeneity range has been observed from X-ray powder diffraction of as cast alloys, a=4.743–4.712Å, c=3.567–3.768Å. Its crystal structure was investigated by X-ray diffraction from Ce(Au1−xSbx)2 (x=0.266) single crystal: CAD-4 automatic diffractometer, Mo Kα radiation, a=4.7256(6)Å, c=3.6711(6)Å, P6/mmm space group, V=70.997(17)Å3, Z=1, ρ=10.732Mg/m3, μ=76.369mm−1, R1=0.0415, wR2=0.0793 for 99 reflections with I>2σ(I0). The coordination polyhedron of X (X=0.734Au+0.266Sb) atom is a full-capped trigonal prism [XCe6X3X2]. Ce atom is coordinated by 14 atoms: [CeX12Ce2]. The compound is isotypic with UHg2 structure, a deformation derivative of AlB2 structure type. It forms isostructural compounds with La and Pr.