Heat-insulating wall, and heat-insulating housing and method for producing the same

A heat-insulating wall comprising:

• a wall body whose hollow portion is a heat-insulating space;
• an open-cell resin body formed of a thermosetting resin, with which the heat-insulating space is filled by integral foaming;
• and
• powder dispersed in the open-cell resin body,
• the open-cell resin body comprising:
• a plurality of cells;
• a first through-hole formed so as to extend through the thermosetting resin located between neighboring cells;
• and
• a second through-hole formed at an interface between the thermosetting resin and the powder,
• wherein the plurality of cells communicate with one another through the first through-hole and the second through-hole,
• the dispersed powder is incompatible with the thermosetting resin, and
• the open-cell resin body comprises one of an open-cell urethane foam and an open-cell phenol foam.