An image forming apparatus comprising: an image bearing member configured to bear a toner image; an intermediary transfer belt onto which the toner image is transferred from said image bearing member; a transfer member, to which a voltage is applied, configured to transfer the toner image from said intermediary transfer belt onto a recording material in a transfer portion; a voltage source configured to apply the voltage to said transfer member; a current detecting portion configured to detect a current flowing though said transfer member; and a controller configured to carry out constant voltage control so that the voltage applied to said transfer member becomes a predetermined voltage in a case in which the detection result detected by the current detecting portion is within a predetermined range during the recording material passing through the transfer portion, characterized in that in a case in which the detection result is out of the predetermined range during the recording material passing through the transfer portion, the controller is configured to correct the predetermined voltage so that the detection result falls within the predetermined range, and perform the constant voltage control with the corrected predetermined voltage, and said controller is configured to set an upper limit and a lower limit of the predetermined range on the basis of a current flowing through said transfer member when the voltage is applied to said transfer member or a voltage applied to said transfer member when a current is supplied to said transfer member, in a state in which the recording material is absent in said transfer portion. an image bearing member configured to bear a toner image; an intermediary transfer belt onto which the toner image is transferred from said image bearing member; a transfer member, to which a voltage is applied, configured to transfer the toner image from said intermediary transfer belt onto a recording material in a transfer portion; a voltage source configured to apply the voltage to said transfer member; a current detecting portion configured to detect a current flowing though said transfer member; and a controller configured to carry out constant voltage control so that the voltage applied to said transfer member becomes a predetermined voltage in a case in which the detection result detected by the current detecting portion is within a predetermined range during the recording material passing through the transfer portion, characterized in that in a case in which the detection result is out of the predetermined range during the recording material passing through the transfer portion, the controller is configured to correct the predetermined voltage so that the detection result falls within the predetermined range, and perform the constant voltage control with the corrected predetermined voltage, and said controller is configured to set an upper limit and a lower limit of the predetermined range on the basis of a current flowing through said transfer member when the voltage is applied to said transfer member or a voltage applied to said transfer member when a current is supplied to said transfer member, in a state in which the recording material is absent in said transfer portion.