PURPOSE: To realize perfect shield and moreover provide a substrate shield structure ensuring good workability by reducing a space required for shielding and acquiring sufficient compression of a conductive substance provided with respect to cabinet.

CONSTITUTION: In a substrate shield structure where a conductive cabinet 10 consisting of an upper cover 1 and a lower cover 2 and a peripheral region 3b surrounding the predetermined region 3a of a substrate 3 to be accommodated within the cabinet 10 are placed in contact to shield the predetermined region 3a, a conductive rib 6 to be in contact with the peripheral region 3b from the upper cover 1 and lower cover 2 is projected toward the inside of the cabinet 10 and the end part of this rib 6 is covered with the U-shaped part of the conductive material 4 having the U-shaped cross-section. The rib 6 is placed in contact with the peripheral region 3b through the conductive material 4.