Heat-insulating structural material, and low temperature and ultra-low temperature liquefied gas carrier using the same

A heat-insulating structural material comprising:

• an upper metal plate;
• a lower metal plate disposed below the upper metal plate in a thickness direction of the heat-insulating structural material to define a space therebetween;
• a vacuum heat insulator inserted into the space between the upper metal plate and the lower metal plate;
• a non-foaming resin surrounding the entirety of the vacuum heat insulator while being closely bonded to inner surfaces of the upper metal plate and the lower metal plate;
• and
• a connecting portion provided to a first distal end of the lower plate and a second distal end of the upper plate to prevent thermal bridging while securing structural fastening, the connecting portion including a combination of a metal layer and a non-metal layer, the metal layer and the non-metal layer being stacked in the thickness direction, the metal layer and the non-metal layer overlapping with each other in a region outside the first distal end and the second distal end when seen in the thickness direction.