a developing apparatus for an image forming apparatus , the developing apparatus comprising a developer carrying member for carrying a developer to develop an electrostatic latent image formed on an image bearing member ; and a regulating member contacted to the developer carrying member to regulate a layer thickness of the developer on the developer carrying member , wherein the developer carrying member includes a surface layer having a storage modulus e ′ satisfying 15 pa ≦ e ′≦ 30 pa , the regulating member includes an free end having a curved surface to define a space with the surface layer to provide an entrance for the developer , and the curved surface has a radius of curvature r satisfying 100 μm ≦ r ≦ 500 μm .