PURPOSE: To improve durability and prevent electric leak by attaching a ceiling face plate or a ceiling panel including a ceiling face plate to the underside of a supporting structure for supporting a roof face plate or a roof panel.

CONSTITUTION: A roof face plate 43 is bonded to the surface of a roof frame 42 formed by assembling a plurality of frame members 41 to form a roof panel 4. A ceiling face plate 55 is fitted into a ceiling frame 54 formed by assembling an outer frame 51, ceiling joist 52, and ceiling joist receiver 53 and bonded to the underside of the joist 52 to form a ceiling panel 5. A wall face plate 62 is bonded to the surface of a supporting frame 61 formed by assembling an upper frame 63, longitudinal frame 64, and lower frame 65 to form a supporting panel 6. Further two roof panels 4, one ceiling panel 5, and two supporting panels 6 are combined and bonded to one another to form a ridge side roof unit 2.