Transfer device and image forming apparatus including regulation member

A transfer device comprising:

• an endless type member that is caused to circulate by a driving unit;
• a plurality of transfer members (1) that come into contact with a rear surface of the endless member, (2) that are disposed opposite to a plurality of image holding members configured to hold toner images of different colors with the endless member interposed therebetween, respectively, and (3) that transfer the toner images respectively formed on the image holding members to the surface of the endless member;
• a support member that movably supports a specific transfer member of the plurality of transfer members that is located at a position more upstream in a circulation direction of the endless member than a contact position and that is located closest to the contact position, the contact position being where a recording medium to which the toner images formed on the endless member are transferred by the transfer members comes into contact with the endless member;
• a regulation member that regulates movement of the specific transfer member in a state in which the specific transfer member is disposed at a position where the toner image formed on the corresponding image holding member is transferred to the endless member;
• a first impelling member that impels the support member to the regulation member;
• and
• a second impelling member that impels the transfer members other than the specific transfer member to the rear surface of the endless member,
• wherein set positions of the other transfer members are determined by causing an impelling force of the second impelling member to match a reaction force generated by the endless member due to the impelling force of the second member.