A pharmaceutical injecting device comprises a main body case, a piston, a drive mechanism, a display component, and a controller. The body case has a cartridge holder in which a pharmaceutical syringe is installed. The piston is provided movably with respect to the pharmaceutical syringe that is installed in the cartridge holder. The drive mechanism drives the piston. The controller is electrically connected to the drive mechanism. The display component is connected to the controller. The controller has a display controller. The display controller causes the display component to display a plurality of injection sites and to display at two or more injection sites selectable displays indicating that those injection sites are suitable for injection.