An image forming apparatus includes a transfer roller pressed against an image carrier for transferring an image from the image carrier to a recording medium being conveyed via a nip between the transfer roller and the image carrier. The transfer roller is positioned in an angular range of less than 90 from the top of said image carrier in the direction of rotation of the image carrier. In addition, the transfer roller has a greater diameter at its opposite end portions than at its center portion in the axial direction thereof.

 
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