To provide a radio-wave shielding room which can be assembled by a simple construction operation, particularly has a firm corner and excellent radio shielding properties.

The structure of the radio-wave shielding room 1 is constituted by properly combining and connecting radio-wave shielding walls 2 and L-shaped radio-wave shielding corner walls 3 having the same wall thicknesses as the walls 2 by using joint members 4 composed of the combination of joint base materials 5, in which groove rails 5b having narrow widths in opening sections are erected and projected from one-side surfaces of tie plates 5a, joint plates 6 in which a plurality of holes 9 are formed in parallel, thin tie plates 7 in which a plurality of tapped holes 10 are formed in parallel and which can be inserted into the groove rails 5b, and bolts 8.