Developing device and image forming apparatus including a regulating member

A developing device comprising:

• a developer carrier configured to hold developer;
• a supply member configured to supply the developer to the developer carrier while agitating the developer;
• a transport member that is disposed obliquely upward in a vertical direction of the supply member,
• a partition member configured to partition the supply member from the transport member,
• wherein the transport member is configured to deliver and transport the developer while agitating the developer through a passageway portion provided at each end portion in an axial direction of the supply member;
• and
• wherein the partition member comprises a regulating member that is provided at a position corresponding to the passageway portion,
• wherein the passageway portion is configured to deliver the developer from the supply member to the transport member,
• wherein the regulating member is configured to regulate movement of the developer from the supply member to the developer carrier, and
• wherein the developing device is configured such that separated developer from a surface of the developer carrier is transported to the supply member.