An energy treatment device comprising: a longitudinal probe that is adapted to transmit an ultrasonic vibration; a first electrode portion as a distal end portion that is provided on a distal end side of the probe, that includes a first electrode adapted to transmit a high-frequency current, and that is adapted to treat a treatment object by the ultrasonic vibration and the high-frequency current; a sheath that is adapted to transmit the high-frequency current and that has a hollow portion and a distal end, wherein the sheath is electrically insulated from the probe, and wherein the first electrode portion projects from the distal end in a state where the probe is inserted into the hollow portion; a fixed handle that is provided on a proximal end portion of the sheath and on which an operator places a first finger; a movable handle that has, on a proximal side, a finger placing portion on which the operator places a second finger, and that has, on a distal side, a jaw including a second electrode portion, and adapted to grasp the treatment object together with the first electrode portion, wherein the jaw is movable between an opening position and a closing position with respect to the first electrode portion, according to an opening and closing operation of the movable handle with respect to the fixed handle; a jaw side through hole portion that is provided in the movable handle and formed between the finger placing portion and the jaw; a sheath side through hole portion that is provided in the sheath and provided at a position at which the sheath side through hole portion does not overlap with the hollow portion; and an opening/closing axis member that is inserted in the jaw side through hole portion and the sheath side through hole portion to thereby attach the jaw to the sheath, so that the movable handle is openable and closable with respect to the fixed handle, and the second electrode portion is electrically connected to the sheath. a longitudinal probe that is adapted to transmit an ultrasonic vibration; a first electrode portion as a distal end portion that is provided on a distal end side of the probe, that includes a first electrode adapted to transmit a high-frequency current, and that is adapted to treat a treatment object by the ultrasonic vibration and the high-frequency current; a sheath that is adapted to transmit the high-frequency current and that has a hollow portion and a distal end, wherein the sheath is electrically insulated from the probe, and wherein the first electrode portion projects from the distal end in a state where the probe is inserted into the hollow portion; wherein the sheath is electrically insulated from the probe, and wherein the first electrode portion projects from the distal end in a state where the probe is inserted into the hollow portion; a fixed handle that is provided on a proximal end portion of the sheath and on which an operator places a first finger; a movable handle that has, on a proximal side, a finger placing portion on which the operator places a second finger, and that has, on a distal side, a jaw including a second electrode portion, and adapted to grasp the treatment object together with the first electrode portion, wherein the jaw is movable between an opening position and a closing position with respect to the first electrode portion, according to an opening and closing operation of the movable handle with respect to the fixed handle; a jaw side through hole portion that is provided in the movable handle and formed between the finger placing portion and the jaw; a sheath side through hole portion that is provided in the sheath and provided at a position at which the sheath side through hole portion does not overlap with the hollow portion; and an opening/closing axis member that is inserted in the jaw side through hole portion and the sheath side through hole portion to thereby attach the jaw to the sheath, so that the movable handle is openable and closable with respect to the fixed handle, and the second electrode portion is electrically connected to the sheath.