Hornblende gabbroic inclusions are often observed in alkali olivine basalts together with preidottite inclusions at the continental margins. We recently found hornblende gabbroic inclusions in calc-alkali rocks in Central Japan. These inclusions in both kinds of Volcanic rock are mainly composed of tschermakitic hornblende and calcic plagioclase, and sometimes include minor aluminous clinopyroxene From the mineralogical view point, they cannot be explained to have been formed at ordinary plutonic conditions. It is suggested from the similarity of mineralogical features and the confined distribution between the hornblende gabbroic inclusions in the calc-alkali rocks and those from the alkali basalts that they are derived from the same position in the depth and they have considerable development under the continental margins. We cannot give a definite conclusion about the source of these hornblende gabbroic inclusions, because we have not sufficient data on the water content near the Mohorovicic discontinuity and the stability field of such mineral assemblage. It is likely that they are originated at considerable depty in the earth, however, as for example, the basement of the crust.