Abstract: A high frequency snare is provided with a snare loop; a control rod of flat plate shape with a cross-section having a long axis direction and a short axis direction; a distal end side connecting member in which a proximal end of the snare loop and a distal end of the control rod are inserted; and a control wire which is elongated in an axial direction of the control rod and connected to the control rod through a proximal end side connecting member. The distal end side connecting member is provided with a first opening end surface in the axial direction. The first opening end surface is formed with inclined surfaces which intersect the axial direction of the control rod and the short axis direction of the cross-section of the control rod and are parallel with the long axis direction of the cross-section of control rod.