Provided is a display panel device including a pixel unit including a luminescent layer, and a lens that covers a luminescent region of the luminescent layer placed above the pixel unit and that transmits light emitted from the luminescent layer. The height between a luminescent face of the luminescent region and an apex of the lens is uniform along the straight line in the long axis direction of the luminescent region. Furthermore, at both end parts of the lens, a cross-section of the light emitting side corresponding to the long axis direction of the luminescent region has a shape of an elliptic arc having a predetermined curvature.