An EL device includes a substrate having a square shape, an
element-forming region provided on an upper surface of the substrate and
having organic light-emitting elements, a protruding section arranged in
a region between the element-forming region and an end portion of the
substrate, and a protection film deposited in a region extending from the
element-forming region to the end portion of the substrate and disposed
so as to cover the protruding section. The protruding section is disposed
in a substantially strip-like shape along at least two of four sides of
the substrate.