| 摘要 |
Memory card (1) includes at least semiconductor chip (3), circuit board (2) with semiconductor chip (3) mounted on main surface (21), having at least rigidity reducing portion (23) formed in main surface (21) or in a linear region of surface (22) opposite to the main surface, and cover portion (71) for covering semiconductor chip (3) on main surface (21) of circuit board (2), wherein circuit board (2) has a plurality of convex regions (201) which flex in a convex shape toward main surface (21) due to rigidity reducing portion (23).
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