A conveying mechanism capable of preferably inhibiting the portion of a transfer belt located in an image forming area from meandering. A plurality of ribs (84) are provided so as to extend approximately parallel to a transfer direction (X) on an upper surface (8a) of a guide member (8). The intervals between the ribs (84) are constituted to be gradually narrowed in the left direction (Y). A transfer belt (3) is gradually moved in the left direction (Y) by the abutment between an inner side face (3d) thereof and the plurality of ribs (84). The movement of the transfer belt (3) in the left direction (Y) is limited and restricted by the abutment between a right side face (81a) of a projection piece (81) of the guide member (8) and a left side face (3b) of the transfer belt (3).
