Image Forming Device Having Feed Tray and Retaining Unit Retaining Photosensitive Drums

An image forming device comprising:

• a main casing;
• a retaining unit retaining a plurality of photosensitive drums juxtaposedly arrayed and spaced away from each other in an array direction, the retaining unit movable in the array direction between a mounted position in which the retaining unit is mounted in the main casing and a pulled-out position in which the retaining unit is pulled out of the main casing;
• a transfer belt arranged in confrontation with the plurality of photosensitive drums to be transferred with developer supported on each photosensitive drum, the transfer belt having a downstream end portion in a mounting direction in which the retaining unit is moved from the pulled-out position to the mounted position;
• a transfer roller disposed in confrontation with the downstream end portion to transfer the developer, which is transferred to the transfer belt, to a transferred medium;
• and
• a feed tray comprising a lift member that is configured to lift a first transferred medium and a plate disposed above the lift member and configured to place thereon a second transferred medium which is different from the first transferred medium and which has been supplied into the main casing.