An image forming apparatus, comprising: an image forming section configured to form an image on an image carrier; a transfer roller configured to transfer the image formed on the image carrier to an image receiving medium; a support body (64, 65) configured to support the image carrier in a main body opposite to the transfer roller; a holding member arranged in the support body (64, 65) to hold two end parts of the transfer roller and having a conductive member that makes electrical contact with the transfer roller when the transfer roller is mounted in the holding member; and a power supply section configured to apply transfer bias to the image carrier and to the transfer roller through the conductive member; the transfer roller includes a rotation shaft and a bearing supporting two end parts of the rotation shaft, and the bearing is in electrical contact with the conductive member when the bearing is mounted in the holding member; the holding member comprises a U-shaped holding arm for holding the bearing, characterized in that: the conductive member comprises a linear U-shaped conductive spring mounted in the holding arm, two ends of the conductive member form curvature parts that protrude in the direction of the bearing towards the inside of the holding arm, a circle shaped twisted part is formed at the center part of the conductive member, the conductive member having a spring force in a direction towards the inside of the holding arm through the twisted part, and part of the linear spring is in electrical contact with the bearing of the transfer roller when the bearing is held by the holding arm. an image forming section configured to form an image on an image carrier; a transfer roller configured to transfer the image formed on the image carrier to an image receiving medium; a support body (64, 65) configured to support the image carrier in a main body opposite to the transfer roller; a holding member arranged in the support body (64, 65) to hold two end parts of the transfer roller and having a conductive member that makes electrical contact with the transfer roller when the transfer roller is mounted in the holding member; and a power supply section configured to apply transfer bias to the image carrier and to the transfer roller through the conductive member; the transfer roller includes a rotation shaft and a bearing supporting two end parts of the rotation shaft, and the bearing is in electrical contact with the conductive member when the bearing is mounted in the holding member; the holding member comprises a U-shaped holding arm for holding the bearing, characterized in that: the conductive member comprises a linear U-shaped conductive spring mounted in the holding arm, two ends of the conductive member form curvature parts that protrude in the direction of the bearing towards the inside of the holding arm, a circle shaped twisted part is formed at the center part of the conductive member, the conductive member having a spring force in a direction towards the inside of the holding arm through the twisted part, and part of the linear spring is in electrical contact with the bearing of the transfer roller when the bearing is held by the holding arm.