Developing device, process cartridge, and image forming apparatus

A developing device comprising:

• a developer bearer rotatable in a rotation direction and forming a developing range to develop a latent image on an image bearer;
• a holder having:
• a facing face facing a portion of the developer bearer upstream from the developing range in the rotation direction of the developer bearer;
• a support face defining a part of an outer face of the developing device;
• and
• a relay face extending from one end of the support face to one end of the relay face connected to the facing face to form an acute tip portion, the acute tip portion closer to the developing range than the one end of the support face;
• and
• an entrance seal having a free end projecting from the one end of the support face as a cantilever,
• wherein a first length of the entrance seal from a tip of the free end of the entrance seal to the one end of the support face is shorter than a second length of the relay face from the acute tip portion to the one end of the support face at least at a part of a center portion of the entrance seal in a longitudinal direction of the entrance seal.