An injection device comprises a locking-mechanism in the form of two buttons(17) located on the front end of the injection device. In an engaged position,the locking mechanism prevents removal of a cap (111) from the injection deviceand, in a disengaged position, prevents movement of a syringe carrier (127) holdinga syringe but permits removal of the cap from the housing. This assists in preventingdamage to the syringe prior to actuation of the injection device.