A package includes a main unit having formed therein a through hole that penetrates the package from a first surface to a second surface; and a connection terminal that is provided inside the through hole. The second surface is a bottom surface of the main unit, and has an electric circuit incorporated therein. The connection terminal is electrically connected to the electric circuit incorporated in the main unit, and configured to be contactable by an insertion target that is inserted in the through hole from a side of an inserting direction.