Provided is a freezing apparatus comprising an overheat control unit (44) constituted to adjust the opening of an indoor expansion valve (26) on the basis of a control gain for deciding the opening operation stroke of the indoor expansion valve (26). The overheat control unit (44) includes a control gain deciding unit (41) for setting the control gain (g) higher than the current level, when a target overheat deciding unit (39) makes a target overheat (SHs) higher than the current level, and lower than the current level, when the target overheat (SHs) is made lower than the current level.
