An ion probe includes a metal wire, a metal sheath covering the metal wire, insulation powder provided between the metal wire and the metal sheath, and a ceramic capillary. A portion of the metal wire projecting from a distal end of the metal sheath is passed through the ceramic capillary. The ceramic capillary is bonded to the distal end of the metal sheath by an organic adhesive layer. A part of the insulation powder located at the distal end of the metal sheath is covered with the organic adhesive layer.