An exhaust gas purification catalyst comprising a catalyst support and bimetallic particles supported thereon, wherein said bimetallic particles comprise an at least partial solid solution of rhodium and iridium and have a diffraction peak at 40.66 DEG <2 <41.07 DEG in X-ray diffraction with a CuK+- ray. A method for producing an exhaust gas purification catalyst, comprises heating a mixed solution containing a rhodium salt, an iridium salt and a reducing agent at a temperature sufficient to reduce rhodium and iridium, thereby producing bimetallic particles comprising an at least partial solid solution of rhodium and iridium; and supporting the produced bimetallic particles on a catalyst support.