An injection device comprising: an elongate housing for receiving a syringe or capsule in use, the housing having a window or viewing aperture through which the contents of the syringe or capsule may be inspected in use a shutter element movable between a revealing position in which the window or viewing aperture is visible and a concealing position in which the window or viewing aperture is concealed, and bias means biasing the shutter element towards its concealing position.
