An image reading apparatus including: a conveyor; a first reading unit; a second reading unit; a first frame; and a second frame. The first reading unit extends in a prescribed direction and has a first end on a first side and a third end on a second side opposite to the first side in the prescribed direction. The second reading unit extends in the prescribed direction and has a second end on the first side and a fourth end on the second side. The second reading unit is disposed opposite to the first reading unit with a conveying path along which a sheet is conveyed interposed therebetween. The first frame includes first and second engagement portions configured to be engaged with the first and second ends, respectively. The second frame includes third and fourth engagement portions configured to be engaged with the third and fourth ends, respectively.