An image reading apparatus includes a document table, a pressing plate that rotates about a rotation axis between an open position and a closed position, a line sensor that includes an image sensor arranged in a main scanning direction intersecting the rotation axis and outputs data by reading a document on the document table, and a control unit that determines presence or absence of the document based on first data acquired by the line sensor when the pressing plate is in an intermediate position before reaching the closed position and second data acquired by the line sensor when the pressing plate is in the closed position, wherein when the control unit determines the presence or absence of the document based on the first data and the second data, the control unit uses coefficient data that is smaller as a distance from the rotation axis is longer.