The treatment instrument handle includes a handle body that is held by an operator, a first operation input body that is provided in the handle body and is rotatable in a first direction and a second direction with respect to the handle body, and the first The first operation input body is provided so as to be rotatable in a third direction and a fourth direction with respect to one operation input body, and moves as an operation is input to the first operation input body. When rotated in the direction, the first operation input body rotates in the second direction when it is rotated in an appropriate direction of the third direction and the fourth direction and engaged with the handle body. And the interlocking body that is rotatable in the fifth direction and the sixth direction with respect to the handle main body and is engaged with the handle main body when rotated in the fifth direction. And a second operation input body to which an operation is input so that the match is released.処置具用ハンドルは、操作者に保持されるハンドル本体と、前記ハンドル本体に設けられ、前記ハンドル本体に対して第１方向及び第２方向に回動可能な第１操作入力体と、前記第１操作入力体に対して第３方向及び第４方向に回動可能に設けられ、前記第１操作入力体に操作が入力されるのに伴って動き、前記第１操作入力体が前記第１方向に回動されると前記第３方向及び前記第４方向の適宜の方向に回動して前記ハンドル本体に係合されたときに前記第１操作入力体が前記第２方向に回動するのを規制する連動体と、前記ハンドル本体に対して第５方向及び第６方向に回動可能で、前記第５方向に回動されると前記ハンドル本体に係合された前記連動体の係合が解除されるように操作が入力される第２操作入力体とを有する。
