An image reading apparatus a chassis, a sheet supporting unit disposed on the chassis configured to receive a sheet of a document placed thereon, a reading unit movably disposed on the chassis and configured to read an image on the sheet placed on the sheet supporting unit while moving in a predetermined direction, a reference member provided at a side portion of the sheet supporting unit, the sheet being placed on the sheet supporting unit such that one end of the sheet contacts the reference member, and an electrostatic capacitive touch key unit disposed on a side portion of the chassis is provided. Additionally, the reference member and the electrostatic capacitive touch key unit are arranged at opposite side portions, in the predetermined direction, of the chassis.