An image reading apparatus includes: a sheet table including a placement surface on which a sheet is placed; a light emitting device including light sources; a light emitting unit including a plurality of light emitting devices for emitting light to the placement surface; a light receiving unit; a read image conversion unit converting the received light into read image information; a pulse signal output unit that outputs a pulse signal; a plurality of drive current supply units supplying drive currents to the plurality of light emitting devices; a light emission control unit; a first light emission parameter determination unit; and a second light emission parameter determination unit. The light emission control unit controls the light sources to emit the same color light in sequence based on a drive current value of a first and second light emitting devices and a light emission time of the light sources.