A refrigerator includes: a refrigerator main body having a cooling chamber; a cooling chamber door for opening and closing the cooling chamber; a shelf assembly provided within the cooling chamber such that a height thereof is adjustable; and a basket provided in any one of the refrigerator main body and the cooling chamber door such that a height thereof is adjustable. A space of the refrigerator main body or the cooling chamber door can be utilized to facilitate receiving and keeping food items.