A new kind of energy efficient window using switchable mirror thin film which can be switched between mirror and transparent state freely is developed. Pd capped Mg_6Ni thin film prepared by magnetron sputtering shows excellent switching property. By exposure to 4% H_2 in Ar, the metallic film turns to a transparent state within a few seconds dramatically. A large size switchable mirror glass is fabricated and its switching is confirmed. Also all-solid-state swithchable mirror device based on Mg-Ni alloy is developed. It can be switched by applying voltage of 5 V to the device. If the switchalbe mirror window will be used practically, it is effective to reduce energy consumption for air-conditioning in buildings and automobiles.%2005年に京都議定書が発効し，日本もCO_2の削減目標のrn達成が義務付けられているが，状況は厳しく，特に民生部門rnにおいては削減どころか逆に1990年比で33%も増加してしrnまっている．このように，民生部門における省エネルギーのrn推進が急務となっている中で，産業技術総合研究所のサステrnナブルマテリアル研究部門では，住宅における省エネルギーrnに効果的な新しい建材に関する研究を総合的に行っている．rnそのような材料のひとつが調光ガラスである．
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