An image forming apparatus comprising: an image bearing member; a charging member configured to charge the image bearing member; a developer bearing member configured to carry a developer ( t) for forming a developer image by developing an electrostatic image on the image bearing member; a developer storage portion configured to store the developer ( t) to be carried by the developer bearing member; a transfer portion configured to transfer the developer image, formed on the image bearing member, onto a recording material; and a fixing device configured to fix the developer image on the recording material, wherein the developer ( t) remaining on the image bearing member without being transferred to the recording material is moved from the image bearing member to the developer bearing member and then recovered in the developer storage portion, characterized by the image forming apparatus further comprising a control portion configured to implement control such that, in a case a second image is formed on a rear face of the recording material after a first image is formed on a surface of the recording material and the first image is fixed by the fixing device, (i) a second potential difference between (i-1) a surface potential of the image bearing member after being charged with the charging member when forming the second image and (i-2) a potential of the developer bearing member is less than (ii) a first potential difference between (ii-1) a surface potential of the image bearing member after being charged with the charging member when forming the first image and (ii-2) a potential of the developer bearing member. an image bearing member; a charging member configured to charge the image bearing member; a developer bearing member configured to carry a developer ( t) for forming a developer image by developing an electrostatic image on the image bearing member; a developer storage portion configured to store the developer ( t) to be carried by the developer bearing member; a transfer portion configured to transfer the developer image, formed on the image bearing member, onto a recording material; and a fixing device configured to fix the developer image on the recording material, wherein the developer ( t) remaining on the image bearing member without being transferred to the recording material is moved from the image bearing member to the developer bearing member and then recovered in the developer storage portion, characterized by the image forming apparatus further comprising a control portion configured to implement control such that, in a case a second image is formed on a rear face of the recording material after a first image is formed on a surface of the recording material and the first image is fixed by the fixing device, (i) a second potential difference between (i-1) a surface potential of the image bearing member after being charged with the charging member when forming the second image and (i-2) a potential of the developer bearing member is less than (ii) a first potential difference between (ii-1) a surface potential of the image bearing member after being charged with the charging member when forming the first image and (ii-2) a potential of the developer bearing member.