Abstract: A nonionic powdery detergent composition having high solubility and dispersibility which are not impaired even when used for washing in high-temperature water and an excellent caking resistance even during storage under a highly humid condition, which contains, as a starting detergent material used for absorbing the nonionic surfactant, an amorphous aluminosilicate having a composition represented by the following formula (I):x(M.sub.2 O).y(MeO).Al.sub.2 O.sub.3.z(SiO.sub.2) (I)wherein M represents an alkali metal atom, Me represents an alkaline earth metal atom, and x, y and z represent the molar numbers of the respective components, with the proviso that they satisfy the following relationship:0.2.ltoreq.x.ltoreq.2.0, 0.ltoreq.y.ltoreq.0.1 and 1.5.ltoreq.z.ltoreq.6.0,and having an oil-absorbing capacity of at least 100 ml/100 g and a water content of 5 to 20% by weight, and wherein the volume of pores having diameters of smaller than 0.1 .mu.