A developer replenishing apparatus including a first developer container for containing a developer to be replenished to a developing apparatus, a second developer container for containing the developer to be replenished to the first developer container, a first replenishing mechanism for replenishing the developer in the first developer container to the developing apparatus, a second replenishing mechanism for replenishing the developer in the second developer container to the first developer container, a driving source capable of simultaneously driving the first replenishing mechanism and the second replenishing mechanism wherein, at an operated state of the driving source, a replenishing amount of the developer per unit time from the second developer container to the first developer container is larger than a replenishing amount of the developer per unit time from the first developer container to the developing apparatus.