Pharmaceutical injection device and storage case therefor

A pharmaceutical injection device, comprising:

• a main case that has a pharmaceutical syringe mounting component to which a pharmaceutical syringe is mounted;
• a piston that is provided movably with respect to the pharmaceutical syringe mounted to the pharmaceutical syringe mounting component;
• a driver that drives the piston;
• a power switch that switches power on and off;
• a display component that is provided to the main case;
• a needle mounting component;
• a needle detector that is provided to the main case and directly or indirectly detects whether an injection needle is mounted to the needle mounting component;
• a controller that, after a user switches off the power switch, executes a first control that displays on the display component a message directly or indirectly prompting the user to remove the injection needle when the needle detector detects that the injection needle is mounted to the needle mounting component;
• and
• a cap that is disposed on a distal end side of the pharmaceutical syringe mounting component and that is removably attached to or removed from the main case,
• wherein the cap has:
• an opening formed opposite a distal end of the pharmaceutical syringe mounting component;
• and
• a cover for opening and closing the opening,
• wherein the injection needle protrudes from the opening when the injection needle is mounted to the needle mounting component, and
• wherein the needle detector indirectly detects whether the injection needle is mounted to the needle mounting component by detecting whether the cover is open or closed.