An ultra-low temperature freezer comprising: a housing including: an exterior body including a first side and a second side that faces the first side in a transverse direction; an interior body provided inside the exterior body, the interior body being formed with a storage space that opens in a forward direction; a thermal insulator provided between the exterior body and the interior body, the thermal insulator being formed of a vacuum insulated panel; an evaporator disposed between the exterior body and the interior body to surround the storage space; and polyurethane provided between the thermal insulator and the interior body; at least one inner door that closes an opening of the storage space when closed; a hinge including a pivot extending in a perpendicular direction, and a first hinge piece and a second hinge piece that rotate relative to each other about the pivot, the first hinge piece being mounted to the second side; and an outer door that opens and closes by rotating about the pivot, the outer door including a third side and a fourth side that faces the third side and is mounted with the second hinge piece, wherein the outer door further includes: an inner face that closes the storage space when closed; an outer face provided forwardly of the inner face; a thermal insulator being formed of a vacuum insulated panel; and polyurethane provided between the thermal insulator of the outer door and the outer face; characterized in that the thermal insulator of the outer door is provided near the inner face; and the outer door further includes a connecting face connecting an outer-face edge that is positioned in the transverse direction and a fourth-side edge that is positioned in the forward direction with the outer-face edge that is positioned in the transverse direction being located forwardly of the fourth-side edge that is positioned in the forward direction, the connecting face being a flat surface or a recessed surface, and wherein the recessed surface is formed of only points that are positioned toward the inner face from a virtual plane connecting the outer-face edge that is positioned in the transverse direction and the fourth-side edge that is positioned in the forward direction. a housing including: an exterior body including a first side and a second side that faces the first side in a transverse direction; an interior body provided inside the exterior body, the interior body being formed with a storage space that opens in a forward direction; a thermal insulator provided between the exterior body and the interior body, the thermal insulator being formed of a vacuum insulated panel; an evaporator disposed between the exterior body and the interior body to surround the storage space; and polyurethane provided between the thermal insulator and the interior body; an exterior body including a first side and a second side that faces the first side in a transverse direction; an interior body provided inside the exterior body, the interior body being formed with a storage space that opens in a forward direction; a thermal insulator provided between the exterior body and the interior body, the thermal insulator being formed of a vacuum insulated panel; an evaporator disposed between the exterior body and the interior body to surround the storage space; and polyurethane provided between the thermal insulator and the interior body; at least one inner door that closes an opening of the storage space when closed; a hinge including a pivot extending in a perpendicular direction, and a first hinge piece and a second hinge piece that rotate relative to each other about the pivot, the first hinge piece being mounted to the second side; and an outer door that opens and closes by rotating about the pivot, the outer door including a third side and a fourth side that faces the third side and is mounted with the second hinge piece, wherein the outer door further includes: an inner face that closes the storage space when closed; an outer face provided forwardly of the inner face; a thermal insulator being formed of a vacuum insulated panel; and polyurethane provided between the thermal insulator of the outer door and the outer face; an inner face that closes the storage space when closed; an outer face provided forwardly of the inner face; a thermal insulator being formed of a vacuum insulated panel; and polyurethane provided between the thermal insulator of the outer door and the outer face; characterized in that the thermal insulator of the outer door is provided near the inner face; and the outer door further includes a connecting face connecting an outer-face edge that is positioned in the transverse direction and a fourth-side edge that is positioned in the forward direction with the outer-face edge that is positioned in the transverse direction being located forwardly of the fourth-side edge that is positioned in the forward direction, the connecting face being a flat surface or a recessed surface, and wherein the recessed surface is formed of only points that are positioned toward the inner face from a virtual plane connecting the outer-face edge that is positioned in the transverse direction and the fourth-side edge that is positioned in the forward direction.