There is provided a method for producing a permanent magnet magnetic circuit that makes it possible to stably attach a permanent magnet to a yoke and to use a general-purpose assembly jig or to reuse an existing assembly jig even when the size or shape of a magnet to be attached is changed. More specifically, there is provided a method for producing the circuit comprising a magnet or magnet unit and a yoke, the method comprising the steps of: fixing the magnet or magnet unit to an assembly jig through an electrically detachable adhesive; fixing the magnet or magnet unit fixed to the jig, to the yoke; and applying a voltage between the magnet or magnet unit and the assembly jig to detach the adhesive from the magnet or magnet unit to detach the adhesive from the jig so as to detach the magnet from the jig.