The invention relates to a wall element for a magnetically shielded room and to a magnetically shielded room. The wall element comprises at least one first layer (1) which is formed of
metal plate having a high electrical
conductivity, and at least two
layers, a second layer (2) and a third layer (3), which consist of
metal plates having a high magnetic permeability. The
layers (1, 2, 3) are superimposed one on top of another in surface contact with each other without any separating air gaps, so that each first layer (1) having a high electrical
conductivity lies between each second (2) and third
layers (3) having a high permeability substantially in surface contact with the second and third layers, the layers together forming a compact structure in which the product (σ×μ) of electrical
conductivity (σ) and permeability (μ) is maximized so as to minimize the
penetration depth of magnetic interference.