A method of disassembling a washing machine is a disassembling method for a washing machine including a reduction-gear unit secured on the outside of a water tub and a dehydration tub disposed in the water tub, and the method includes a release step of applying force, along the axial direction of a rotary shaft, in the direction of separating the reduction-gear unit and the dehydration tub from each other to release connection between the reduction-gear unit and the dehydration tub. This scheme can be employed to provide a method of disassembling a washing machine that can recover resin included in the washing machine at a high recovery ratio.