A SYRINGE, ON WHICH A NEEDLE MEMBER (60) IS MOUNTED, INCLUDES A BARREL (10), A PLUNGER (30) AND A STOPPER (40). THE BARREL (10) HAS A CHAMBER, A STOP PORTION (13) ADJACENT TO THE NEEDLE MEMBER (60), A LOCK PORTION ON A WALL OF THE CHAMBER AND A NEEDLE MOUNT (50). THE PLUNGER (30) HAS A LOCK DEVICE (33) AND AN OPERATION PORTION (37) FOR OPERATION. A STOPPER (40) HAS A STOPPER BODY (41) TO BE SQUEEZED INTO THE CHAMBER OF THE BARREL (10) FOR MOVEMENT, A LOCK FLANGE (42) ON THE STOPPER BODY (41) TO BE ELASTICALLY DEFORMED AND TO BE LOCKED WITH THE LOCK PORTION OF THE BARREL (10). THE LOCK DEVICE (33) IS PROVIDED TO THE STOPPER BODY (41) TO BE CONNECTED TO THE LOCK DEVICE (33) OF THE PLUNGER (30) THAT CONNECTS THE STOPPER (40) TO THE PLUNGER (30) TO MOVE TOGETHER. WHILE THE PLUNGER (30) IS DRAWN, THE LOCK DEVICE (33) OF THE PLUNGER (30) ON THE STOPPER (40) IS BROKEN AND THE STOPPER (40) IS RESTRICTED IN THE BARREL (10). FIG.1
