`
`An ultra~low temperature freezer includes: an
`
`insulated case defining a storage compartment having an
`
`opening in an upper face; an insulated door capble of
`
`opening and closing the opening; a first refrigeration
`
`unit configured such that a first compressor, a first
`
`condenser, and a first decompressor are mounted on a first
`
`mounting board; a second refrigeration unit configured
`
`such that a second compressor, a second condenser, and a
`
`second decompressor are mounted on a second mounting
`
`board; a machinery compartment provided near the insulated
`
`case, and configured to house the first and second
`
`refrigeration units to be independently drawable in the
`
`horizontal direction; and a control unit, where a control
`
`10
`
`15
`
`circuit is mounted, configured to be drawable
`
`independently of the first and second refrigeration units,
`
`the first and second refrigeration units and the control
`unit being housed in the machinery compartment to be
`
`20
`
`stacked in a vertical direction.
`
`43
`
`