A drum frame includes a first regulating portion located between a transfer nip and a downstream end of a conveyance surface in a conveyance direction. The first regulating portion faces the conveyance surface from above the conveyance surface. The first regulating portion includes a first horizontal portion and a pair of first inclined portions. The first horizontal portion extends in a width direction perpendicular to the conveyance direction. The pair of first inclined portions extends from both ends of the first horizontal portion in the width direction. Each first inclined portion has one end adjacent to the first horizontal portion and an other end away from the one end in the width direction. Each first inclined portion is inclined to be closer to an endless belt from the one end toward the other end.