A high-frequency treatment instrument for supplying a high frequency current from a power supply, comprising: a treatment portion main body for treating biological tissue; a treatment electrode that is provided on a surface of the treatment portion main body that is in contact with the biological tissue; and a power supply device (14, 15, 17, 24), wherein the treatment portion main body includes a first forceps component of which an external surface is formed from a non-conductive material and a second forceps component which includes a conductive portion and a non-conductive portion, the first forceps component and the second forceps component are joined together by a pivot shaft, an electrode surface of the conductive portion is in contact with the biological tissue by exposing a surface of the conductive portion that faces the first forceps component, and the power supply device electrically connects together the conductive portion and the power supply such that a conductive external surface thereof is not exposed, characterized in that the high-frequency treatment instrument further includes: a wire whose distal end side is pivotably connected to a proximal end of the pair of the first forceps component and the second forceps component; and an energizing component that electrically connects together the conductive portion and the power supply, and is provided such that it is not electrically connected to the wire, and that supplies the high frequency current to the conductive portion. a treatment portion main body for treating biological tissue; a treatment electrode that is provided on a surface of the treatment portion main body that is in contact with the biological tissue; and a power supply device (14, 15, 17, 24), wherein the treatment portion main body includes a first forceps component of which an external surface is formed from a non-conductive material and a second forceps component which includes a conductive portion and a non-conductive portion, the first forceps component and the second forceps component are joined together by a pivot shaft, an electrode surface of the conductive portion is in contact with the biological tissue by exposing a surface of the conductive portion that faces the first forceps component, and the power supply device electrically connects together the conductive portion and the power supply such that a conductive external surface thereof is not exposed, characterized in that the high-frequency treatment instrument further includes: a wire whose distal end side is pivotably connected to a proximal end of the pair of the first forceps component and the second forceps component; and an energizing component that electrically connects together the conductive portion and the power supply, and is provided such that it is not electrically connected to the wire, and that supplies the high frequency current to the conductive portion. a wire whose distal end side is pivotably connected to a proximal end of the pair of the first forceps component and the second forceps component; and an energizing component that electrically connects together the conductive portion and the power supply, and is provided such that it is not electrically connected to the wire, and that supplies the high frequency current to the conductive portion.