An ice bin of a refrigerator, comprising: a case which opens an upper surface for flowing the ice into the inside and has a diffuser at one side of the bottom for ejecting the ice to the outside; an auger installed at the inside of the case for transferring the flowed ice; guides (131, 132) for guiding the transferred ice; a grinding part that grinds the guided ice by said guide (131, 132); a shutter that opens and closes said diffuser in order to selectively eject the ice to the outside of said case; and an ice ejecting control part capable of controlling the amount of ice that is ejected to the outside of said case, wherein said grinding part comprises: a fixing blade fixed and arranged at a right angle with the bottom of said case; and a rotating blade arranged so as to be rotated by connecting to said auger, wherein said guides (131, 132) comprise: a first guide that is inclined downward from the surface of one side of said case to said grinding part side and extended by separating at a certain distance from said grinding part; and a second guide that is inclined downward from the other surface facing with said one side surface of said case to said grinding part and extended to the adjacent location from said fixing blade, characterized in that said ice ejecting control part is a flap which is extended from one part of the first guide to the location that is adjacent to rotating trace of the grinding part and is installed to selectively eject the ice that is stacked on the flap down from said ice ejecting control part by the amount of the stacked ice, and wherein said flap is made of a flexible material or hinge-engaged with one end of the first guide by forming a hinge part at one end of the first guide for performing elastic rotary motion about one end of the first guide as a center, and a twisted spring is installed at the hinge part. a case which opens an upper surface for flowing the ice into the inside and has a diffuser at one side of the bottom for ejecting the ice to the outside; an auger installed at the inside of the case for transferring the flowed ice; guides (131, 132) for guiding the transferred ice; a grinding part that grinds the guided ice by said guide (131, 132); a shutter that opens and closes said diffuser in order to selectively eject the ice to the outside of said case; and an ice ejecting control part capable of controlling the amount of ice that is ejected to the outside of said case, wherein said grinding part comprises: a fixing blade fixed and arranged at a right angle with the bottom of said case; and a rotating blade arranged so as to be rotated by connecting to said auger, a fixing blade fixed and arranged at a right angle with the bottom of said case; and a rotating blade arranged so as to be rotated by connecting to said auger, wherein said guides (131, 132) comprise: a first guide that is inclined downward from the surface of one side of said case to said grinding part side and extended by separating at a certain distance from said grinding part; and a second guide that is inclined downward from the other surface facing with said one side surface of said case to said grinding part and extended to the adjacent location from said fixing blade, a first guide that is inclined downward from the surface of one side of said case to said grinding part side and extended by separating at a certain distance from said grinding part; and a second guide that is inclined downward from the other surface facing with said one side surface of said case to said grinding part and extended to the adjacent location from said fixing blade, characterized in that said ice ejecting control part is a flap which is extended from one part of the first guide to the location that is adjacent to rotating trace of the grinding part and is installed to selectively eject the ice that is stacked on the flap down from said ice ejecting control part by the amount of the stacked ice, and wherein said flap is made of a flexible material or hinge-engaged with one end of the first guide by forming a hinge part at one end of the first guide for performing elastic rotary motion about one end of the first guide as a center, and a twisted spring is installed at the hinge part.