To easily sort a filter element into its metal part and a part except this metal part so that the element can be collected, by disassembling the used filter element of cartridge type.

This disassembling device is constituted by a drive roller 11 formed in an external peripheral part with a recessed part 15 capable of receiving a flange part 75 protruded to a bottom part peripheral edge of a cartridge type filter element 61, support roller 21 capable of holding a rotational condition of the filter element with this drive roller 11, and a rotary cutter 41 movable so as to abut to a peripheral surface of the filter element 61. The drive roller 11 comprises a brim part 13, recessed part 15, and a barrel part 17. The support roller 21 is moved in a manner approaching to and separating from the drive roller 11. A receiving base 33 capable of loading a bottom part of the filter element 61 is provided.