IMAGE FORMING APPARATUS

To reduce time and effort for replacement work in replacing each other positions of an image forming unit 18S for S and an image forming unit 18K for K to change a color order of overlapping toner images.SOLUTION: An image forming apparatus has pre-supply storage containers 55S and 55K for S and K arranged replaceable with each other, and sets lengths of transport tubes 53S and 53K such that even if end attachment positions on toner storage bottles 51 of the transport tubes 53S and 53K are not replaced with each other, the ends on the pre-supply storage containers of both the transport tubes 53S and 53K reach the pre-supply storage containers 55S and 55K at positions after the replacement. The image forming apparatus comprises: acquisition means that acquires information on colors of toner stored in the pre-supply storage containers 55S and 55K; and a main control unit that determines whether or not the pre-supply storage containers 55S and 55K are at correct positions on the basis of a result of acquisition performed by the acquisition means.SELECTED DRAWING: Figure 8 【課題】Ｓ用の作像ユニット１８ＳとＫ用の作像ユニット１８Ｋとで互いに位置を入れ替えてトナー像の重ね合わせの色順を変更するときにおける入れ替え作業の手間を軽減する。【解決手段】ＳとＫとについて、補給前貯留器５５Ｓ，５５Ｋの位置を互いに入れ替え可能に構成し、移送チューブ５３Ｓ，５３Ｋのトナー収容ボトル５１側の端部取り付け位置を互いに入れ替えなくても、互いの移送チューブ５３Ｓ，５３Ｋにおける補給前貯留器側の端部を入れ替え後の位置にある補給前貯留器５５Ｓ，５５Ｋに届かせるように、移送チューブ５３Ｓ，５３Ｋの長さを設定するとともに、補給前貯留器５５Ｓ，５５Ｋに貯留されているトナーの色情報を取得する取得手段と、これによる取得結果に基づいて補給前貯留器５５Ｓ，５５Ｋについて正しい位置にあるか否かを判定するメイン制御部とを設けた。【選択図】図８