To constitute a curtain wall having excellent fine appearance, and to facilitate mounting operation onto the building frame of a sheathing panel.

A sheathing panel 20 constituting a curtain wall 21 has sheathing panel bodies 23 and fittings 24, opening sections 25 for mounting the fittings 24 are formed to the sheathing panel body 23, and the fittings 24 are set up into the opening sections 25. The sheathing panels 20 are installed extending over sections among building frames, and connected to the building frames by first fasteners 26 fitted at central sections in the cross direction of the upper sections of the building frames, second fasteners 27 mounted at both end sections in the cross direction as both sides of the horizontal direction B1, B2 of the first fasteners 26 in the upper sections and third fasteners 28. The first fasteners 26 are composed in a displaceable and adjustable manner in the horizontal direction B1, B2 and the longitudinal direction, the second fasteners 27 are constituted in the displaceable and adjustable manner in the vertical direction A1, A2 and the longitudinal direction and the third fasteners 28 are organized in the displaceable and adjustable manner in the longitudinal direction.