Further, the end portion of the third side cover CV_SF3 of the first enclosure 121 may be in contact with the upper face UF of the second main cover CVB on the second long side LS2 side. The side face of the second main cover CVB on the second long side LS2 side may constitute the third side face SF3 of the memory device 100 together with the outer face of the third side cover CV_SF3. Although the side face of the second main cover CVB on the second long side LS2 side and the outer side of the third side cover CV_SF3 are aligned with each other and may be placed on the same XZ plane, the embodiment is not limited thereto.
The second main cover CVB in the second corner CNR2 and the third corner CNR3 includes a first chamfered part CAF1 and a second chamfered part CAF2, as illustrated in