To lower the temperature of water in a flower tub of cut flowers display tool used for display and sale till the prescribed temperature for a short time.

The upper parts of the inner portion of the cut flowers display tool in which the flower tubs are inserted are divided into two stories of the upper and lower story 10, 11, and evaporators 12, 13 and cooling fans 14, 15 are installed on each divided story. And the evaporation temperature of the upper story 10 evaporator 12 is set lower than the evaporation temperature of the lower story 11 evaporator 13 and the upper part of the flower tub 3 is made lower temperature than the lower part. Thereby, the upper part water in the flower tub 3 becomes heavier than the lower part water and comes down and starts a forced convection current in the flower tub 3, which lowers promptly the temperature of the water, thus enabling to keep the flowers live and vivid for a long time.