Refrigerator and vacuum heat insulating material for use in refrigerator

A refrigerator comprising:

• a heat-insulated box including an inner casing and an outer casing, in which space between the inner casing and the outer casing is filled with a foamed heat insulating material;
• and
• a vacuum heat insulating material disposed in the heat-insulated box together with the foamed heat insulating material, the vacuum heat insulating material including an outer skin material, the outer skin material including at least a core material and being decompression-sealed,
• wherein the vacuum heat insulating material includes a gas adsorbent, and the vacuum heat insulating material is included in at least a side wall of the heat-insulated box,
• the heat-insulated box includes a plurality of vacuum heat insulating materials having different respective degrees of vacuum,
• a top surface and a back surface of the heat-insulated box are demarcated by a first top surface portion and a first back surface portion, respectively, and a recess is formed in a top portion of the heat-insulated box at the back surface side,
• the recess is provided at the back surface side of the first top surface portion and positioned lower than the first top surface portion, the recess including a second top surface portion and a second back surface portion, the second top surface portion being connected to a top of the first back surface portion, the second back surface portion connecting the first top surface portion and the second top surface portion,
• a compressor is disposed on the second top surface portion of the recess, and
• the vacuum heat insulating material including the gas adsorbent is disposed in the second back surface portion and/or the second top surface portion.