Provided are a magnet gasket and a cooling apparatus which enhance thermal insulation performance. The cooling apparatus includes: a thermal insulation box that has an opening end surface enclosing the opening and facing frontward; a door capable of opening and closing the opening; and a magnetic gasket attached to an inside peripheral portion of the door facing the opening end surface while the opening is closed, the magnetic gasket having: a magnet; a magnet retaining part; and a heat insulation sheet being provided between the magnet and the magnet retaining part and being provided, in a closed state in which the opening is closed by the door, on a side portion on a side of the door on a peripheral surface of the magnet and on a side portion facing an inner side in a width direction inthe closed state on the peripheral surface of the magnet.