An autoinjector that receives a pre-filled syringe, having a central body and an actuator sleeve provided with one end that comes into contact with the user. The actuator sleeve can be moved between projecting and actuation positions and it is in the projecting position prior to and following the actuation of the autoinjector. An injection mechanism is provided to inject the product when the needle is inserted into the user's body. The autoinjector also includes a barrel movement device to move the needle into the injection position and retract the needle from the body following injection. The movement device includes a control ring rotatably mounted in the central body, the ring having an inclined internal profile that engages with an internal projection of a control sleeve that can move axially in the central body, such that the sleeve moves axially when the ring is rotated.