The present invention relates to a medicinal-liquid administering device. A medicinal-liquid administering device (10) is provided with a disposable part (12), which is disposable, and a reusable part (14), which is reusable. The disposable part (12) has a movable part (nut part (24)) that is moved from an initial position and presses a plunger (20) toward a distal-end side. When the first position detection sensor (74) detects that the movable part is not at the initial position in a state before the movable part is moved, the alarm part (78) outputs a first alarm.
