Developing device, image forming apparatus

A developing device comprising:

• a storage portion storing developer including toner;
• a developer carrying member of a cylindrical shape having a magnet in an inside thereof and configured to rotate in the storage portion while carrying the developer on an outer circumferential surface thereof;
• a stirring portion including a blade portion spirally extending outward, the stirring portion facing the developer carrying member with a first gap therebetween and stir the developer in the storage portion by rotating;
• a layer thickness restricting portion located on a downstream side of the stirring portion in a rotation direction of the developer carrying member, the layer thickness restricting portion facing the developer carrying member with a second gap therebetween and restricting a layer thickness of the developer carried by the developer carrying member;
• and
• a guide portion disposed between the stirring portion and the layer thickness restricting portion, wherein
• the guide portion includes:
• a first guide surface on which a plurality of convex portions or a plurality of concave portions are formed, the first guide surface facing the stirring portion with a third gap therebetween, the third gap being a passage through which the developer passes toward the first gap;
• and
• a second guide surface facing the developer carrying member with a fourth gap therebetween, the fourth gap being a passage through which the developer passes toward the second gap.