An object of the present invention is to provide a new .mu.-oxo bridged heterometal compound, which can make the photo-functional materials to have diversified properties, and a production method such that the .mu.-oxo bridged heterometal compound is obtained simply, selectively and with high yield. The present invention provides .mu.-oxo bridged heterometal compounds, NcM1-O-M2Nc, PcM1-O-M2Nc and NcM1-O-M2Pc wherein Nc represents naphthalocyanine, Pc represents phthalocyanine, M1 represents a metal atom which is able to have a valence of up to three, and M2 represents a metal atom which is able to have a valence of four or five.