A hemostatic tool capable of being used for pressing an arm and arresting hemorrhage includes: first and second jaws for pinching the arm by approaching to each other along a first direction a supporter for supporting the first and second jaws such that they can move linearly along the first direction a resilient body coupled to at least one of the first and second jaws, and applying a biasing force to pull the first and second jaws away from each other a ratchet mechanism for resisting the biasing force and temporarily holding the first and second jaws at an arbitrary position and a button for releasing the ratchet mechanism.可利用在壓迫胳臂而進行止血的止血器係具備:第1及第2顎部,係藉由沿著第1方向彼此接近而夾住前述胳臂;支撐部,係以可沿著前述第1方向直線地移動的方式支撐前述第1及第2顎部;彈性物體,係與前述第1及第2顎部之至少一者結合而賦予用以使前述第1及第2顎部彼此分離的彈推力;棘輪機構,係抵抗前述彈推力而將前述第1及第2顎部暫時地停留在任意的位置;及按鈕,係解除前述棘輪機構。1‧‧‧上顎部3‧‧‧下顎部7‧‧‧按鈕9‧‧‧外殼15‧‧‧棘輪機構19‧‧‧彈簧21‧‧‧上齒條23‧‧‧下齒條29‧‧‧銷31‧‧‧銷33‧‧‧柱體39‧‧‧復歸彈簧
