Developing device and image forming apparatus

A developing device comprising:

• an accommodating section that accommodates a developer;
• a developing section that rotates such that an upper portion thereof in a gravitational direction moves from an outer side of the accommodating section to an inner side of the accommodating section, the developing section performing developing on an image holding body with the developer;
• a transporting section that is disposed below the developing section in the gravitational direction and that transports the developer in an inside of the accommodating section;
• a flow channel portion that extends from the inner side of the accommodating section to the outer side of the accommodating section;
• a first wall portion that extends towards the transporting section at an end portion on an inner side of the flow channel portion and that faces the developing section;
• and
• a second wall portion that extends towards the transporting section at the end portion on the inner side of the flow channel portion and that faces the first wall portion on a side opposite to the developing section, a distance from the second wall portion to an outer peripheral edge of the transporting section being greater than or equal to a distance from the first wall portion to the outer peripheral edge of the transporting section.