Palladium-containing composition and method for producing hydrogen peroxide

Provided is a method for producing hydrogen peroxide, whereby hydrogen peroxide can be produced with high production efficiency. According to the present invention, provided is a palladium-containing composition which contains palladium particles and a coating agent that coats the surfaces of the palladium particles, and which is characterized by containing, as the coating agent, a compound having an O = X structure (wherein X represents any of a phosphorus atom, a sulfur atom and a carbon atom). 本发明寻求一种能够以高制造效率制造过氧化氢的过氧化氢的制造方法。根据本发明，提供一种含钯的组合物，其含有钯颗粒和包覆该钯颗粒的表面的包覆剂，该组合物的特征在于，作为上述包覆剂，含有具有O＝X结构(X表示磷原子、硫原子和碳原子中的任意原子)的化合物。