Patent ID: 7667982

Claim:
An LSI package with an interface module comprising: an interface module having a first surface and a second surface and including a wiring board having a first through hole, a driving element unit selectively provided on the second main surface, a transmission line connected to the driving element unit and configured to transmit and receive a signal, and a first electrical connection terminal formed on the second surface and electrically connected to the driving element unit; an interposer having a third surface facing the second surface and a fourth surface opposite to the third surface, and including a signal processing LSI mounted on the third surface, a second electrical connection terminal provided on the third surface, a mounting board connecting terminal provided on the fourth surface and a second through hole, the interposer being arranged so that the first through hole matches with the second through hole; and a movable guide pin inserted into the first through hole and the second through hole so that the first electrical connection terminal is connected to the second electrical connection terminal, to position the interface module and the interposer, wherein one of the first through hole and the second through hole is a first reference hole, the movable guide pin includes a cylinder portion to be fitted into the other of the first through hole and the second through hole and having a diameter larger than the first reference hole, and a tapered portion including one end to be matched with the cylinder portion and the other end having a diameter smaller than that of the first reference hole, the movable guide pin movable in a direction in which the interposer faces the interface module is provided in a preliminarily fixed state, and the tapered portion of the movable guide pin is pressed to an opening edge of the first reference hole to determine relative positions of the interface module and the interposer in an in-plane direction.