PROBLEM TO BE SOLVED: To suppress vibrations resulting from an uppermost door and prevent resonance without adding a vibration-proof member to a refrigerator body.SOLUTION: A party wall 55 is integrally formed by an upper inner box 52a forming a refrigeration compartment 56 disposed on the inner and upper sides of a storage compartment which is insulated and divided into an upper part and a lower part by the party wall 55, insulating materials in the party wall 55 are foamed and charged integrally with insulating materials 24 of an insulated box body 51, and further an inherent frequency of a refrigeration compartment door 56a is set lower than the lowest frequency in running a compressor 80. Therefore, it is possible to suppress vibrations in the insulated box body 51 and vibration propagation to the refrigeration compartment door 56a due to vibrations of the compressor 80, thereby preventing the refrigeration compartment door 56a from being resonated.