the supporting bracket 50 is connected to the ice cube tray 20 and the driver 30 the supporting bracket 50 has a supporting shaft coupling groove 52 at one side to which the supporting shaft 26 of the ice cube tray 20 is coupled and supported the ultrasonic vibrator 70 vibrates the ice cube tray 20 and indirectly undulates water filled in the cubes 22 of the ice cube tray 20 discharging air from the water thus the air is uniformly removed from the water filled in the cubes 22 of the ice cube tray 20 the ultrasonic vibrator 70 is attached to an outer side of the ice cube tray 20 a position of the ultrasonic vibrator may vary as long the ice cube tray vibrates further the ultrasonic vibrator may be plurally provided as necessary also the ultrasonic vibrator may be detachably provided in the ice cube tray 20 therefore when the quality of the ice is not important for example when a shattered ice is needed the ultrasonic vibrator may be detached from the ice cube tray 20 according to the configuration above operations of the icemaker will be described hereinbelow with respect to fig3 first the cubes 22 of the ice cube tray 20 is filled with water supplied from a water supply then the water filled in the cubes 22 is frozen into.