A fragrance injection device is used in combination with a gas container containing a fragrance therein. The device includes a body designed to cover the upper portion of the gas container. A coupler unit is provided below the body for coupling the upper portion of the gas container and the body together. An injector unit is arranged inside the body for, when operated, opening the nozzle of the gas container to periodically inject or spray the fragrance contained in the gas container. A control unit is arranged inside the body for controlling the operation of the injector unit. A cover unit is removably fixed to the body for covering the front surface of the body, the cover unit including an upper cover designed to hide the injector unit and a lower cover configured to surround the upper portion and the nozzle of the gas container.
