To provide a device for automatically dismantling and disassembling a device contaminated by dangerous material such as PCB contained device by remote operation without direct touch and without requiring a worker to wear protective clothing having high closed density.

In this dismantling device for a device contaminated by dangerous material, a cutting unit 15, having a variable cutting angle and provided with a round saw 12 for cutting in dry state is provided to freely move to upper and lower positions and right and left positions, and a gripper 20 for gripping a cut material to be cut by the cutting unit is provided to freely move to upper and lower positions and right and left positions. Further the device is provided with a table 3 for placing the PCB-contained oil device, whereby the dismantling device can be performed by remote operation from the on-off state of cutting operation to the operation of the holder.