The present invention is a silver alloy having excellent reflectance and transmittance, containing silver as a main component and as a first added element group at least one of the precious metals platinum, palladium, gold, rhodium and iridium. Here, the first added element group is preferably platinum, palladium and gold, and further, it is preferable to add as a second added element group at least one of gallium, copper and dysprosium. Further, the added element concentration total is preferably 0.01 to 20.0 atom%.