A solid-state drive device includes a memory module in which at least one non-volatile memory device is mounted, a first heat storage unit and a second heat storage unit covering upper and lower parts of the memory module, respectively, to store heat emitted by the memory module, and having at least portions connected to each other, respectively, a cover having a space in which the memory module and the first and second heat storage units are received and arranged with a spacing distance from the first and second heat storage units, respectively, and an inner frame arranged between the cover and at least one of the first and second heat storage units, to provide the spacing distance.