To correctly cool a coffin in which the body is housed without increasing a temperature of the room in which the coffin is placed even during a hot summer day.

In this coffin cooling device, a box-shaped equipment 1 which can be placed next to a coffin B is provided with a cooling water tank 3 to store cooling water, a freezer unit 2 which uses the cooling water tank 3 as a refrigerant condenser, and an air conditioner unit 4 which generates cooling air by performing a heat exchange with the refrigerant distiller 22 of the freezer unit 2. A cooling air is blown from an outlet 5b of a cooling air blower 5 into the coffin B through a gap created on the top face of the coffin B by shifting the lid C of the coffin B, and the air in the coffin B is sucked into the inlet of the air conditioner unit 4 through return ports 5c, 5c provided at the cooling air blower 5.