A cleaning unit and an electrophotographic image forming apparatus including the cleaning unit that prevents a cleaning blade from overturning is disclosed. The cleaning unit includes a cleaning blade that contacts an outer circumference of an object to be cleaned with a predetermined pressure, and thus removes material remaining on the outer circumference of the object while the object is rotating. A bracket is connected to one side of the cleaning blade and supports the cleaning blade. A support frame is connected to the other side of the cleaning blade (that is, a side opposite to the side where the bracket is connected), and is placed close to the object to be clean. The support frame prevents the cleaning blade from being bent in a rotation direction of the object.