To provide a method for treating wastes, capable of rapidly carrying out the treatment of wastes in disaster area by natural disasters such as earthquakes and tsunamis, and reducing the period and cost until the restoration.

Wastes are collected at a primary temporary placement site installed in each district; then when the wastes collected at the plurality of primary temporary placement sites are collected at a secondary temporary placement site and subjected to an intermediate treatment, the treatment includes at least one of a utilizable extraction step or a recycle processing step; in the occurrence site of the wastes and the primary temporary placement sites and the secondary temporary placement site, at least one of cleaning, disintegration or crushing, and sieving is carried out to make sizes of resultant individual pieces into ≤50 cm; secondary wastes are subjected to at least one of a utilizable extraction step or a recycle processing step; and in the secondary temporary placement site, re-selection and re-treatment are carried out to reduce the volume and reduce the time, cost and labor necessary for transportation and the like.