Flange member for syringe

This flange member for a syringe is detachably mounted on the outer tube of a syringe having an injection needle attached to the distal end, and is provided with a first fitting portion for fitting with the distal end of the outer tube, a second fitting portion for fitting with the proximal end of the outer tube, and a flange portion connected to the first fitting portion and the second fitting portion. When mounted on the distal end of the outer tube using the first fitting portion, the flange portion becomes an auxiliary tool for during puncturing with the injection needle, and when mounted to the proximal end of the outer tube using the second fitting portion, the flange portion becomes an auxiliary tool during grasping the outer tube.