Developer replenishing apparatus

A developer replenishing apparatus for replenishing a replenishing developer to a developing apparatus for developing an electrostatic image, the replenishing apparatus comprising:

• a first developer container for containing the replenishing developer to be replenished to the developing apparatus;
• a second developer container for containing the replenishing developer to be replenished to the first developer container;
• a first replenishing mechanism for replenishing the replenishing developer in the first developer container to the developing apparatus;
• a second replenishing mechanism for replenishing the replenishing developer in the second developer container to the first developer container;
• and
• 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 replenishing developer per unit of time from the second developer container to the first developer container is larger than a replenishing amount of the replenishing developer per unit of time from the first developer container to the developing apparatus.