Developing device and image forming apparatus

A developing device comprising:

• a developer holding member that holds a developer on a surface thereof to transport the developer to a developing region in which a latent image is developed as a visible image;
• an accommodating section that accommodates the developer supplied to the developer holding member;
• a supply section that is connected to the accommodating section and disposed above the developer holding member in the direction of gravity to supply the developer to the developer holding member from above;
• a first transport member that is disposed in the supply section to transport the developer and transports the developer in the developer accommodated in the supply section to a developer transport section that connects the accommodating section and the supply section outside of a region corresponding to the developer holding member;
• and
• a detecting member disposed in the developer transport section that detects the developer in the developer transport section.