Optical reading apparatus and image forming apparatus

An optical reading apparatus and a multifunction-type image forming apparatus, with a minimized thickness in a cabinet height direction and a housing shaped along an upper shape of discharge tray of the image forming apparatus provided thereunder. The optical reading apparatus comprises: platen glass defined with one end and the other end, on an upper surface of which an original document is placed; an optical reading unit that translates between the both ends on a lower surface of the platen glass, for obtaining image data by irradiating an original document surface with light through the platen glass; a control circuit board connected to the optical reading unit, for processing an electric signal; and a housing wherein a side on the side of the other end is thicker than a side on the side of the one end. The image forming apparatus has a cabinet containing: sheet discharge unit for discharging an image formation sheet from a lower-part lower-side on the thicker side of the housing of the optical reading apparatus toward a lower-part upper side on the thinner side of the housing; and a discharge tray on which the image formation sheet discharged from the sheet discharge unit is received and stacked.