Solutions The injection device which possesses the gear device which gives the gear ratio with movement of axial direction of the injection button and movement of axial direction of the piston rod is offered. As for the injection device, it has the dosage quantitative setting component which possesses the axis of rotation which can set the dosage quantity by turning relatively vis-a-vis the housing. Therefore, while setting the dosage quantity, the gear device with the dosage quantitative setting component can obstruct the fact that it turns with that axis of rotation. With that, because of the gear device, the space where it is necessary to offer inside the housing is decreased. Because of that, this space such as additional electronic part using for other purpose, for example, to design the injection device in the form which is suited for other purpose or the fact that etc size of the injection device is decreased it becomes possible e.g., it possesses relatively even section. According to one execution feature of this invention, the gear device is not parallel to the axis of rotation of the dosage quantitative setting component, it has one which possesses the vertical axis of rotation for example vis-a-vis the axis of rotation of the dosage quantitative setting component gear wheel at least. According to the other execution feature of this invention, the gear device, the drive spindle which has the screw which possesses 1st pitch, and has the piston rod which has the screw which possesses 2nd pitch. The gear is formed by both screw.< Selective figure > Figure 1【解決手段】注射ボタンの軸方向の移動と、ピストンロッドの軸方向の移動との間のギア比を与えるギア装置を有する注射装置が提供される。注射装置は、ハウジングに対して相対的に回転することによって投与量を設定することができる回転軸を有する投与量設定部材を備えている。従って、投与量の設定中、ギア装置は、投与量設定部材と共にその回転軸で回転するのを妨げられる。それによって、ギア装置のために、ハウジング内部に提供する必要のある空間が低減される。そのため、この空間を追加の電子部品など他の目的に使用すること、例えば、比較的平坦な断面を有するなど、他の目的に適した形で注射装置を設計すること、あるいは注射装置の大きさを低減することなどが可能になる。本発明の一実施態様によれば、ギア装置は、投与量設定部材の回転軸に平行ではない、例えば投与量設定部材の回転軸に対して垂直な回転軸を有する少なくとも1つのギアホイールを備えている。本発明の他の
