To obtain a dust collecting device of high temperature exhaust gas filled with solid particles capable of keeping dust collecting efficiency high while reducing pressure loss as a filter medium.

In a dust collecting device of high temperature exhaust gas using solid particles as a filter medium, the total thickness of the filter medium is made thin in an exhaust gas direction and a plurality of interfaces increasing the frequency of inertial collision of dust contained in the exhaust gas with the filter medium discontinuously against the exhaust gas flow direction are provided.