Provided is a method for manufacturing an organic EL device which suppresses a deterioration in the light emission properties. In this method, while first and second electrode layers are prevented from being in contact with each other, an organic layer is allowed to protrude from the first electrode layer toward at least both outer sides in the longitudinal direction of a substrate. Further, the second electrode layer is allowed to protrude from the organic layer toward at least both outer sides in the longitudinal direction. Thereby, the first electrode layer, the organic layer, and the second electrode layer are formed so that both end edges of the organic layer in a longitudinal direction of the substrate are covered by both end sides of the second electrode layer in the longitudinal direction, on at least both outer sides of the light emitting part in the longitudinal direction.