An element housing package includes a substrate, a frame body, and an input-output terminal. The input-output terminal has a wiring conductor formed in a stacked body consisting of dielectric layers and ground layers which are alternately laminated, to extend through an inside of the stacked body, and a lead terminal connected to the wiring conductor. A non-formation region is provided in the ground layers around the wiring conductor, which passes through the inside of the input-output terminal in a vertical direction of the stacked body. The non-formation region has, in order from an upper side toward a lower side, a first non-formation section, a second non-formation section having an area smaller than that of the first non-formation section, and a third non-formation section having an area larger than that of the second non-formation section.