Patent ID: 8225983

Claim:
A joining jig comprising: a pair of flat-plate sandwiching portions including sandwiching faces which sandwich a plate member laminate body which is joined; a plurality of vapor inflow ports provided on a sandwiching face of a first flat-plate sandwiching portion so that the plurality of vapor inflow ports receive a surplus vapor of solder generated by heating the plate member laminate body; a plurality of vapor flow paths provided inside the first flat-plate sandwiching portion and on an upper face of the first flat-plate sandwiching portion that is opposite the sandwiching face so that the vapor flow paths communicate with the vapor inflow ports to constitute flow paths of the surplus vapor of the solder; and a plurality of vapor discharge ports provided on a side surface of the first flat-plate sandwiching portion so that the vapor discharge ports communicate with the vapor flow paths to discharge the surplus vapor of the solder to the outside, wherein the plurality of vapor flow paths provided on the upper face form channels in the upper face that terminate at the vapor discharge ports, and the vapor discharge ports are adjacent to the upper face and do not extend to the sandwiching face.