Treatment tool

A treatment tool comprising:

• an insertion portion that is hollow and elongated, the insertion portion including a plurality of holes, each hole being configured to communicate between an inside and an outside of the insertion portion;
• a shaft that is arranged in the insertion portion, the shaft being configured to move forward and backward in a longitudinal direction of the insertion portion;
• a plurality of needles that are connected to the shaft, each needle being configured to move between a first position and a second position according to forward and backward move of the shaft, the first positon being a position in which the needle protrudes from the hole to the outside of the insertion portion, the second position being a positon in which the needle is positioned in the insertion portion;
• a plurality of first insulating materials, each insulating material being configured to cover the needle;
• and
• an energy supplier configured to supply electric power to the plurality of needles,
• wherein the hole is configured to regulate a protruding direction of the needle to a direction intersecting with the longitudinal direction of the insertion portion, the protruding direction of the needle being a direction in which the needle protrudes to the outside of the insertion portion, and
• when an area that is positioned outside the insertion portion out of a whole area of the needle at the first position is sectioned into two areas that are a first area and a second area, the first insulating material is configured to cover the second area, the first area being an area containing a distal end of the needle, the second area being an area excluding the first area.