[Problem] To provide a pharmaceutical preparation-injecting instrument capable of easily increasing the therapeutic effect of the pharmaceutical preparation. [Solution] A pharmaceutical preparation-injecting instrument: which is provided with an outer needle (10) that is formed as a straight tube with a tip opening (15) and a base opening (16) and that has a standard piercing section (12) on the tip, and an inner needle (20), which is detachably inserted into the outer needle (10) and has a surrounding area-piercing section (22) on the tip in which the inner needle (20) is configured to be capable of exposing and hiding the surrounding area-piercing section (22) in the tip opening (15) by advancing/retracting manipulations at the base end and with which the pharmaceutical preparation supplied from the base opening (16) can be injected from the tip opening (15) when the inner needle (20) is withdrawn from the outer needle (10). The outer needle (10) guides the inner needle (20) so that the surrounding area-piercing section (22) protrudes on the side opposite from the standard piercing section (12) with a plane comprising the axis line therebetween.Le problème de la présente invention consiste à utiliser un instrument dinjection de préparation pharmaceutique pouvant facilement augmenter leffet thérapeutique de la préparation pharmaceutique. La solution selon linvention consiste en un instrument dinjection de préparation pharmaceutique : qui est doté dune aiguille externe (10), qui est formée comme un tube droit muni dune ouverture de pointe (15) et dune ouverture de base (16), et qui présente une section de percement standard (12) sur la pointe, et dune aiguille interne (20), qui est insérée de manière amovible dans laiguille externe (10) et présente une section de percement (22) de la zone environnante sur la pointe. Laiguille interne (20) est configurée pour permettre de faire apparaître et de cacher la section de percement (22) de la zone environnante dans louvertu
