An organic EL light emitting device is provided with: a substrate having a coloring region where two or more pixel regions are arranged in a line; line-shaped main banks which define the coloring region and face each other; pixel separation regions arranged among the pixel regions in the coloring region; a pixel electrode arranged for each of the pixel regions; and organic function layers arranged on the pixel electrodes. In the organic EL light emitting device, auxiliary banks, and grooves for communicating the pixel regions with each other are arranged in the pixel separation regions, and the projection of an end portion of a second pixel region side of a groove arranged in a pixel separation region (A) overlaps an auxiliary bank arranged in a pixel separation region (B) if the end portion thereof is projected from the first pixel region side to the second pixel region side in the line direction of the main banks when three successive pixel regions in the coloring region are set as the first pixel region, the second pixel region, and a third pixel region, and a pixel separation region between the first pixel region and the second pixel region is set as the pixel separation region (A), and a pixel separation region between the second pixel region and the third pixel region is set as the pixel separation region (B).