A light-emitting device mounting package includes a substrate, a frame extending upward from the substrate and surrounding a mounting portion, a lead plate supported on the frame, and a ceramic plate having a facing front surface and a facing back surface on the opposite side. The frame has a first through hole through which the lead terminal extends. The ceramic plate has a second through hole, and a metalized layer formed on the facing front surface such that the metalized layer is spaced from an opening of the second through hole. The lead plate penetrates the first and second through holes and is fixed, via a collar portion, to a region of the facing back surface around an opening of the second through hole on the facing back surface side. The insulating member is fixed to a region around the first through hole via the metalized layer.