The present invention relates to an aid for an injection into a blood vessel and, specifically, an aid for fixing a blood vessel to fix the movement of the blood vessel when the injection is given in the blood vessel. More specifically, the present invention relates to a device for fixing a blood vessel to fix the active movement of the blood vessel, comprising: a fixing device, whose shape is in a ring form which can be attached to hands easily, or in various forms and one leg or a plurality of legs on the lower side.COPYRIGHT KIPO 2015.