An electro-optical device is provided wherein a plurality of electronic
components is integrally mounted on a circuit board and the circuit board
is then connected to an FPC board. In the FPC board, a protrusion portion
extending in the length direction of the FPC board is formed, and
terminals of the protrusion portion and terminals of the circuit board
are connected to each other in a state where an end of the circuit board
overlapping the surface of a main body of the FPC board enters the back
surface side of the protrusion portion and thus the protrusion portion
overlaps the circuit board, so that the circuit board is disposed to
intersect the protrusion portion.