The magnetic field dependence of the torque curves of a ferromagnetic material containing three different regions with uniaxial anisotropy in mutually rectangular alignment was estimated from numerical calculation and an experiment using a model. Two cases, in which the rotation axis corresponded to the [001] and [111]-axes in a cubic crystal, were treated. The calculation was based on a magnetization process in which the magnetic interaction among different regions was assumed to be negligible. The magnetic field dependence of each Fourier component of the torque curve was expressed by a polynomial form of the inverse of the magnetic field, and the coefficient of each term was determined. The experiment was carried out using a model sample made of three nickel wires with their axes aligned at right-angles. The experimental results agreed with the calculation.