A developer regulation member, comprising: developer regulation means for regulating an amount of a developer carried on a developer carrying member which has a core metal portion, said developer regulation means having a laminated structure including a first regulation portion formed of a first material which has a Shore D hardness of not less than 70 degrees or is metal, and a second regulation portion which is disposeable at a side near the developer carrying member and which is formed of a material different from the first material for said first regulation portion, the hardness of said first regulation portion being higher than that of said second regulation portion, and a supporting metal plate for supporting the developer regulation means, wherein said developer regulation means has an edge which is contactable with the developer carrying member, said edge having an inclined portion in predetermined shape at the second regulation portion and satisfying the following relationships: − 20 μm < t − a < 25 μm and t − b < 25 μm, wherein t represents a thickness of the second regulation portion measured in a lamination direction of said second regulation portion, a represents a length of the inclined portion of said developer regulation means measured in the lamination direction, and b represents a length of the inclined portion of said second regulation portion measured in a lamination surface direction perpendicular to the lamination direction along an extension direction of the second regulation portion from a boundary surface between said first regulation portion and said second regulation portion when viewed in a sectional view, said lamination surface direction being the direction along the lamination surface between the laminated first regulation portion and second regulation portion, and characterized in that, in use, a bias voltage applied to said core metal portion of the developer regulation means is the same as a voltage applied to said supporting metal plate when the electrostatic latent image is developed. developer regulation means for regulating an amount of a developer carried on a developer carrying member which has a core metal portion, said developer regulation means having a laminated structure including a first regulation portion formed of a first material which has a Shore D hardness of not less than 70 degrees or is metal, and a second regulation portion which is disposeable at a side near the developer carrying member and which is formed of a material different from the first material for said first regulation portion, the hardness of said first regulation portion being higher than that of said second regulation portion, and a supporting metal plate for supporting the developer regulation means, wherein said developer regulation means has an edge which is contactable with the developer carrying member, said edge having an inclined portion in predetermined shape at the second regulation portion and satisfying the following relationships: − 20 μm < t − a < 25 μm and t − b < 25 μm, wherein t represents a thickness of the second regulation portion measured in a lamination direction of said second regulation portion, a represents a length of the inclined portion of said developer regulation means measured in the lamination direction, and b represents a length of the inclined portion of said second regulation portion measured in a lamination surface direction perpendicular to the lamination direction along an extension direction of the second regulation portion from a boundary surface between said first regulation portion and said second regulation portion when viewed in a sectional view, said lamination surface direction being the direction along the lamination surface between the laminated first regulation portion and second regulation portion, and characterized in that, in use, a bias voltage applied to said core metal portion of the developer regulation means is the same as a voltage applied to said supporting metal plate when the electrostatic latent image is developed.