Abstract: In a ceramic sintered body, the Zr content is 17.5 mass %-23.5 mass % in terms of ZrO2, the Hf content is 0.3 mass %-0.5 mass % in terms of HfO2, the Al content is 74.3 mass %-80.9 mass % in terms of Al2O3, the Y content is 0.8 mass %-1.9 mass % in terms of Y2O3, the Mg content is 0.1 mass %-0.8 mass % in terms of MgO, the Si content is 0.1 mass %- and 1.5 mass % in terms of SiO2, and the Ca content is 0.03 mass %-0.35 mass % in terms of CaO. The total content of Na and K is 0.01 mass %-0.10 mass %, when the K content is converted to K2O and the Na content is converted to Na2O. The balance content is 0.05 mass % or less in terms of oxide.

Abstract: In a ceramic sintered body, the Zr content is 17.5 mass %-23.5 mass % in terms of ZrO2, the Hf content is 0.3 mass %-0.5 mass % in terms of HfO2, the Al content is 74.3 mass %-80.9 mass % in terms of Al2O3, the Y content is 0.8 mass %-1.9 mass % in terms of Y2O3, the Mg content is 0.1 mass %-0.8 mass % in terms of MgO, the Si content is 0.1 mass %- and 1.5 mass % in terms of SiO2, and the Ca content is 0.03 mass %-0.35 mass % in terms of CaO. The total content of Na and K is 0.01 mass %-0.10 mass %, when the K content is converted to K2O and the Na content is converted to Na2O. The balance content is 0.05 mass % or less in terms of oxide.

Abstract: A ceramic sintered member is used as an insulating substrate for mounting of an electronic part and bonded to a copper plate or aluminum plate on at least part of a front face or backside face of the insulating substrate. A powder material to form the ceramic sintered member includes alumina as a main ingredient and further includes as subsidiary ingredients partially stabilized zirconia and magnesia. Content of the partially stabilized zirconia is 1 to 30 percent by weight relative to the entire powder material. Content of the magnesia relative to the entire powder material is within a range 0.05 to 0.50 percent by weight. Mole fraction of yttria in the partially stabilized zirconia being is a range of 0.015 to 0.035. 80 to 100 percent of the zirconia crystals included in the ceramic sintered member is in the tetragonal crystal phase.