A package for mounting a light emitting device thereon. The package includes a substrate, a light emitting device mounting part including a wiring formed on one surface of the substrate, the wiring including two areas that are arranged facing each other and being separated a predetermined interval apart from each other in a plan view, first and second through-wirings that penetrate the substrate and are provided on the two areas, respectively, each of the first and second through-wirings including one end electrically connected to the light emitting device mounting part and another end exposed from another surface of the substrate. A part of each of the first and second through-wirings includes a maximum part having a plan-view shape that is larger than a plan-view shape of the one end of each of the first and second through-wirings.