An image forming apparatus comprising: an image forming portion configured to form an image; and an apparatus body configured to accommodate the image forming portion and a circuit board; wherein the circuit board accommodated in the apparatus body, and provided further on a back side of the image forming apparatus than the image forming portion and on which a circuit component configured to drive the image forming portion is implemented; and a louver unit through which an inside of the apparatus body communicates with an outside of the apparatus body and which is under the circuit board with a space provided between the louver unit and the circuit board, the louver unit comprising a first louver portion and a second louver portion, the first louver portion comprising first slat portions arranged with first openings of the first louver portion as openings between adjacent first slat portions, the second louver portion comprising second slat portions arranged with second openings of the second louver portion as openings between adjacent second slat portions and arrayed in a front-back-direction, wherein the apparatus body comprises such a shape that the louver unit and a surface on which the image forming apparatus is installed oppose each other with a space therebetween, wherein the second slat portions are disposed under the first slat portions such that, in a case where the louver unit is viewed from below in the vertical direction, the second slat portions respectively overlap the first openings, and wherein the first openings and the second openings connect each other via gaps between the first louver portion and the second louver portion and communicate with the outside of the apparatus body. an image forming portion configured to form an image; and an apparatus body configured to accommodate the image forming portion and a circuit board; wherein the circuit board accommodated in the apparatus body, and provided further on a back side of the image forming apparatus than the image forming portion and on which a circuit component configured to drive the image forming portion is implemented; and a louver unit through which an inside of the apparatus body communicates with an outside of the apparatus body and which is under the circuit board with a space provided between the louver unit and the circuit board, the louver unit comprising a first louver portion and a second louver portion, the first louver portion comprising first slat portions arranged with first openings of the first louver portion as openings between adjacent first slat portions, the second louver portion comprising second slat portions arranged with second openings of the second louver portion as openings between adjacent second slat portions and arrayed in a front-back-direction, wherein the apparatus body comprises such a shape that the louver unit and a surface on which the image forming apparatus is installed oppose each other with a space therebetween, wherein the second slat portions are disposed under the first slat portions such that, in a case where the louver unit is viewed from below in the vertical direction, the second slat portions respectively overlap the first openings, and wherein the first openings and the second openings connect each other via gaps between the first louver portion and the second louver portion and communicate with the outside of the apparatus body.