An image-forming apparatus comprising an image-forming means for forming a toner image and for transferring it onto a recording medium by an electrophotographic system, a fixing means for heat-fixing the toner image onto the recording medium, and a discharge conveying passage for conveying the recording medium onto which the toner image has been heat-fixed to a discharge portion, which are arranged in an apparatus body. The discharge conveying passage extends in the up-and-down direction along one side wall of the apparatus body. A cooling fan is arranged between the image-forming means and the discharge conveying passage on the inside facing the discharge conveying passage for forming an air stream heading from the side of the image-forming means toward the discharge conveying passage. Exhaust ports are formed in the discharge conveying passage facing the cooling fan and in the one side wall.