PURPOSE: To contrive the improvement of a shielding effect by a method wherein the square parts of a shielding room and the corner parts of the shielding room are respectively formed of each corner panel formed integrally with an L letter-shaped section and each corner panel formed integrally with an eaves part at one side end of a member with an L letter-shaped section.

CONSTITUTION: A panel system shielding room 41 is constituted in a structure, wherein a plurality of shielding panels 43 for shielding an electric wave are coupled with one another and sidewall surfaces 47 and a ceiling surface 49 are formed. In this room 41, square parts 51, which are formed of the sidewall surfaces 47 and the sidewall surfaces 47, and square parts 53, which are formed of the sidewall surfaces 47 and the ceiling surface 49 or a floor surface 67, are each formed of each corner panel 55 formed integrally with an L letter-shaped section. Moreover, corner parts 57, which are formed of the two sidewall surfaces and the ceiling surface 49 or the floor surface 67, are each formed of each corner panel 59 formed integrally with an eaves part at one side end of a member with an L letter-shaped section. Thereby, a breakdown of electromagnetic shielding, which is caused by the deformation of corner joints due to an earthquake, can be prevented reliably and a shielding effect can be improved.