To provide an injector aid capable of appropriately fixing an autoinjector to a liquid medicine display portion and surely visually recognizing the degree of reduction of liquid medicine during self injection.SOLUTION: A cylindrical body 10 is capable of attaching a self-injector up to a drug solution display portion of the self-injector. The pedestal portion 11 closes the lower surface of the tubular body 10, and the outer circumferential surface thereof expands downwardly. The hole 12 is provided on the lower surface of the pedestal portion 11, and an injection needle of the self-injector can be inserted therethrough. The notch 13 is provided from the upper end to the side surface of the tubular body 10, and a part of the liquid medicine display portion of the self-injector is matched when the self-injector is attached to the tubular body 10. The extending portions 14 a, 14 b extend from the both end wall surfaces of the notch 13 toward the inside of the notch 13. The rear surface side protrusions 15 a and 15 b are provided from the rear surface of the extended portions 14 a and 14 b toward the inside of the tubular body 10 and are caught by the liquid medicine display portion of the self-injector when the self-injector is attached to the tubular body 10.BACKGROUND OF THE INVENTION【課題】自己注射器を薬液表示部まで適切に固定出来るとともに、自己注射中の薬液の減少具合を確実に視認することが可能な注射器用補助具を提供する。【解決手段】筒体10は、自己注射器を当該自己注射器の薬液表示部まで装着可能である。台座部11は、筒体10の下面を塞ぎ、外周面が下方に向かって拡径する。穴12は、台座部11の下面に設けられ、自己注射器の注射針が挿通可能である。切欠13は、筒体10の上端から側面までに設けられ、自己注射器を筒体10に装着した際に当該自己注射器の薬液表示部の一部が合わさる。延出部14a、14bは、切欠13の両端壁面から切欠13の内側に向かって延出される。背面側突起15a、15bは、延出部14a、14bの背面から筒体10の内部に向かって設けられ、自己注射器を筒体10に装着した際に当該自己注射器の薬液表示部に引っ掛かる。【選択図】図1
