A cleaning device includes a cleaning portion including a blade and a blade supporting member having a flat surface portion, and a cleaning frame including a mounting portion, a disposing portion and an accommodating portion. The disposing portion opposes the flat surface portion with a gap with respect to a thickness direction. The accommodating portion is adjacent to respective sides of the disposing portion with respect to a height direction. A distance between the flat surface portion and the accommodating portion with respect to the thickness direction is larger than the gap. The cleaning device includes a sealing member formed of a thermoplastic resin material and configured to seal the gap by a portion extending in a longitudinal direction between the disposing portion and the flat surface portion. A part of the sealing member is accommodated in the accommodating portion.