An ice bin apparatus includes a case with an open upper portion for receiving pieces of ice. A guide within the case guides the received ice pieces and an auger adjacent to the guide transfers the guided ice pieces. A grinder for grinds the transferred ice pieces and a diffuser located at a bottom portion of the case discharges the ground ice. A shutter having a hinge that allows movement thereof opens or closes the diffuser for selectively discharging the ground ice therethrough, and a shutter press prevention part is capable of preventing the shutter from being pressed down during the grinding of ice pieces performed by the grinder.