An image forming apparatus comprising: a photoreceptor (31a, 31b, 31c, 31d); a developing unit (32a, 32b, 32c, 32d)that forms a toner image on the photoreceptor (31a, 31b, 31c, 31d); an intermediate transfer member that rotates in only one direction and has a surface onto which the toner image formed on the photoreceptor (31a, 31b, 31c, 31d) is primarily transferred; a primary transfer roller (36a, 36b, 36c, 36d) that primarily transfers the toner image formed on the photoreceptor (31a, 31b, 31c, 31d) onto the intermediate transfer member with application of a bias; a first bias applicator that applies a bias to the primary transfer roller (36a, 36b, 36c, 36d); a secondary transfer roller that secondarily transfers the toner image primarily transferred on the intermediate transfer member onto a recording medium with application of a bias; a second bias applicator that applies a bias to the secondary transfer roller; a pre-brush that is placed downstream of the secondary transfer roller along the rotational direction of the intermediate transfer member, has an end portion abutting against the surface of the intermediate transfer member, and used to preliminarily clean off the surface of the intermediate transfer member; a pre-brush bias applicator that applies a bias to the pre-brush; a cleaning brush that is placed downstream of the pre-brush along the rotational direction of the intermediate transfer member, and abuts against the surface of the intermediate transfer member to remove toner remaining on the intermediate transfer member; a collecting roller that is placed so as to abut against the cleaning brush and collects toner clinging to the cleaning brush; a collecting-roller bias applicator that applies a bias to the collecting roller; a cleaning blade that abuts against a surface of the collecting roller and removes toner clinging to the collecting roller; and a control unit that controls the first bias applicator, the second bias applicator, and the pre-brush bias applicator, wherein the control unit executes a first control that, when the toner passes through a position where the secondary transfer roller is placed, controls the second bias applicator to apply to the secondary transfer roller a bias of the opposite polarity to that of a charge of the toner and controls the pre-brush bias applicator to apply to the pre-brush a bias having the same polarity as that of the toner and an absolute value smaller than that of the bias applied by the second bias applicator to remove the toner, which is primarily transferred onto the intermediate transfer member, from the intermediate transfer member; and the control unit executes a second control that, after the execution of the first control, controls the second bias applicator to apply to the secondary transfer roller a bias of the same polarity as that of the charged toner. a photoreceptor (31a, 31b, 31c, 31d); a developing unit (32a, 32b, 32c, 32d)that forms a toner image on the photoreceptor (31a, 31b, 31c, 31d); an intermediate transfer member that rotates in only one direction and has a surface onto which the toner image formed on the photoreceptor (31a, 31b, 31c, 31d) is primarily transferred; a primary transfer roller (36a, 36b, 36c, 36d) that primarily transfers the toner image formed on the photoreceptor (31a, 31b, 31c, 31d) onto the intermediate transfer member with application of a bias; a first bias applicator that applies a bias to the primary transfer roller (36a, 36b, 36c, 36d); a secondary transfer roller that secondarily transfers the toner image primarily transferred on the intermediate transfer member onto a recording medium with application of a bias; a second bias applicator that applies a bias to the secondary transfer roller; a pre-brush that is placed downstream of the secondary transfer roller along the rotational direction of the intermediate transfer member, has an end portion abutting against the surface of the intermediate transfer member, and used to preliminarily clean off the surface of the intermediate transfer member; a pre-brush bias applicator that applies a bias to the pre-brush; a cleaning brush that is placed downstream of the pre-brush along the rotational direction of the intermediate transfer member, and abuts against the surface of the intermediate transfer member to remove toner remaining on the intermediate transfer member; a collecting roller that is placed so as to abut against the cleaning brush and collects toner clinging to the cleaning brush; a collecting-roller bias applicator that applies a bias to the collecting roller; a cleaning blade that abuts against a surface of the collecting roller and removes toner clinging to the collecting roller; and a control unit that controls the first bias applicator, the second bias applicator, and the pre-brush bias applicator, wherein the control unit executes a first control that, when the toner passes through a position where the secondary transfer roller is placed, controls the second bias applicator to apply to the secondary transfer roller a bias of the opposite polarity to that of a charge of the toner and controls the pre-brush bias applicator to apply to the pre-brush a bias having the same polarity as that of the toner and an absolute value smaller than that of the bias applied by the second bias applicator to remove the toner, which is primarily transferred onto the intermediate transfer member, from the intermediate transfer member; and the control unit executes a second control that, after the execution of the first control, controls the second bias applicator to apply to the secondary transfer roller a bias of the same polarity as that of the charged toner.