Patent ID: 7922699

Claim:
An administration instrument for medical use comprising: a body including a skin touch portion; a drug solution cartridge set in the body and configured to store a drug solution therein; an injection needle configured to be detachably attached to the drug solution cartridge; a plunger configured to perform an administration operation by forcing out the drug solution stored in the drug solution cartridge to administer the drug solution; an injection button configured to be pressed so as to enable the plunger to perform the administration operation; an administration operation inhibit unit configured to detect whether or not the injection needle is attached to the drug solution cartridge stored in the body, configured to perform an administration operation of the drug solution via the plunger when the injection button is pressed and when the needle is attached to the drug solution cartridge, and configured to inhibit the administration operation performed by the plunger when the injection button is pressed and when the needle is not attached to the drug solution cartridge, wherein said administration operation inhibit unit includes an injection button-integrated driving lever attached to the injection button and extending in a direction along which the injection button is pressed, and an injection lever arranged in parallel to the plunger, and having, at one end, an end portion sandwiched against the drug solution cartridge by the injection needle; and a spring member configured to pull the injection lever toward the tip of the injection needle.