A developing device includes a developer bearer, an end seal, and an inlet seal. The end seal is disposed in contact with a circumferential surface of each end of the developer bearer in a longitudinal direction of the developer bearer. The inlet seal includes a center portion in the longitudinal direction disposed in contact with the developer bearer and each end in the longitudinal direction disposed in contact with the end seal. The end seal includes a cutout portion at a side closer to the center portion in the longitudinal direction and at an upstream side in a direction of rotation of the developer bearer. The inlet seal covers an edge of the cutout portion in the longitudinal direction.