A radial compressor having a compressor rotor with moving blades; and a compressor housing accommodating a diffuser having guide vanes, wherein the diffuser delimits, at least in sections, a flow ductleading away from the moving blades of the compressor rotor in radial direction. The guide vanes of the diffuser have a flow inlet edge, a flow outlet edge, and a flow-conducting side extending between the flow inlet edge and the flow outlet edge. The guide vanes of the diffuser act on a support body of the diffuser and project into the flow duct that is delimited by the diffuser, at least in sections. The guide vanes of the diffuser merge into the support body of the diffuser to form a curvature region that is defined on the flow side. In each position of the curvature region, i.e. in the region of the flow inlet edge, in the region of the flow outlet edge and in the region between the flow inlet edge and the flow outlet edge, a curvature radius that is defined on the flow side is formedin each case.