Provided is an image reading apparatus that instantaneously executes functions and settings with the setting of a document on a platen glass, and an image forming apparatus. The image reading part according to the present disclosure includes a platen cover, an opening and closing detecting part, and an operation executing part. The document placing position detecting part acquires position placing data by pre-scan of a scanner, when opening of the platen cover is detected, after the opening of the platen cover is detected, and detects a placing position of a document placed on the platen glass based on the acquired placing position detecting data. The operation executing part receives selection of functions corresponding to the placing position detected by the document placing position detecting part and executes the selected function.

An image forming apparatus acquires shape data indicating a shape of a sensing sheet conveyed along a conveyance route, adjusts a position of a first image in first image data including the first image on the basis of a positional relationship between a sheet region in the acquired shape data and a first reference position in the shape data, forms an image based on the adjusted first image data on the sensing sheet, and senses an amount of positional misalignment of an imaging portion to be used to acquire the shape data by using the sensing sheet on which the image has been formed.