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This paper describes an extended application of the infinite element method to three‐dimensional magnetic field problems. First, the partial differential equations for the magnetic field region are expressed in terms of scalar potentials. The system stiffness matrix is then obtained using a variational method. To deal with the boundary conditions at the interfaces between finite element regions and infinite element regions, the collocation method is adopted. The new approach has been applied to a sample problem to verify the performance. The result shows that the infinite element method with some modifications can be applied to three‐dimensional problems and provides good accuracy.