Patent ID: 8457517

Claim:
An image forming apparatus comprising: a chassis; an image carrier on whose surface a toner image is formed; a transfer roller configured to transfer the toner image formed on the image carrier onto a recording medium, the transfer roller including, a roller shaft, and a transfer roller main body fixed on the roller shaft and configured to contact the recording medium on a circumferential surface thereof; a frame disposed inside the chassis; a transfer-roller supporting part configured to support the transfer roller in such a manner that the transfer roller freely turns with respect to the frame and to move the transfer roller to a contact position where the transfer roller main body contacts the image carrier and a spacing position where the transfer roller main body is spaced apart from the image carrier; a terminal member configured to contact an end surface of the roller shaft and supply a voltage to the transfer roller; and a terminal supporting member configured to rotatably support the terminal member with respect to the frame, wherein the terminal member rotates while following the movement of the transfer roller between the contact position and the spacing position, wherein the terminal member maintains a contact state with the end surface of the roller shaft, and wherein the roller shaft has a hole formed in the end surface thereof, the terminal member has a protrusion protruding in such a manner that the protrusion can be inserted into the hole, and the end surface and the terminal member contact each other and are electrically connected when the protrusion is relatively rotatably inserted into the hole.