A refrigerator comprising: a storage room in which a storage space is formed; a door that opens/closes the storage room; an ice storage unit that is provided at the door, the ice storage unit comprising a case in which an ice storage space is formed, and a housing that is provided under the case; a crushing member that is rotatably provided at the ice storage unit and is received in the housing and crushes ices stored in the ice storage space; a driving unit that provides a rotational force to the crushing member and has a rotary shaft rotating in a first direction; a first power transmission unit that is fitted on the rotary shaft and rotates in a second direction; and a second power transmission unit that is separably coupled to the first power transmission unit and transmits power of the first power transmission unit to the crushing member (310, 315), wherein the first power transmission unit is fixed to the door, and the ice storage unit and the second power transmission unit are separably coupled to the door, and characterized in that the second power transmission unit is coupled to the front of the first power transmission unit, and the second power transmission unit includes at least one gear member coupled to the front of the crushing member (310, 315), the housing comprises a first recession extending to have a recessed width under the case and a second recession concavely extending in the direction in which the thickness of the case decreases, and the first power transmission unit is disposed at one side of the first recession and the second power transmission unit is provided at the separable ice storage unit and disposed ahead of the second recession. a storage room in which a storage space is formed; a door that opens/closes the storage room; an ice storage unit that is provided at the door, the ice storage unit comprising a case in which an ice storage space is formed, and a housing that is provided under the case; a crushing member that is rotatably provided at the ice storage unit and is received in the housing and crushes ices stored in the ice storage space; a driving unit that provides a rotational force to the crushing member and has a rotary shaft rotating in a first direction; a first power transmission unit that is fitted on the rotary shaft and rotates in a second direction; and a second power transmission unit that is separably coupled to the first power transmission unit and transmits power of the first power transmission unit to the crushing member (310, 315), wherein the first power transmission unit is fixed to the door, and the ice storage unit and the second power transmission unit are separably coupled to the door, and characterized in that the second power transmission unit is coupled to the front of the first power transmission unit, and the second power transmission unit includes at least one gear member coupled to the front of the crushing member (310, 315), the housing comprises a first recession extending to have a recessed width under the case and a second recession concavely extending in the direction in which the thickness of the case decreases, and the first power transmission unit is disposed at one side of the first recession and the second power transmission unit is provided at the separable ice storage unit and disposed ahead of the second recession.