An electrophotographic image forming apparatus in which a reduction in image density when continuous sheet supply endurance is effected under a low-humidity environment is prevented, and under a high-humidity environment, an image deletion is prevented. Accordingly, a compact-sized cyclone dust-collecting apparatus is realized and maintenance management of the vacuum cleaner becomes easy. An upper having a vamp lining with a toe part is provided where toe part is stitched to the sock liner such that the vamp lining and the sock liner together define a volume for receiving a wearer’s foot.