The magnetic susceptibilities were measured as a function of oxygen concentration and of temperature for the NaCl-type TiO phase. The TiO phase was found to have the small paramagnetic susceptibility with a very weak positive temperature coefficient. The main part contributing to the observed susceptibility is the Pauli spin-paramagnetism due to the 3d-conduction electron. It was estimated from the measurement of susceptibilities that the Fermi level of the TiO phase was located at the concave position in the density of states∼energy curve. In connection with the peculiar defect structure of the NaCl-type TiO phase, one might regard the presence of the “impurity band” due to the electrons fallen in the oxygen vacancies from the 3d-conduction band as the feature of the electronic band structure of this phase. From such a point of view, it is preferably considered that the concave position in the density of states∼energy curve would be formed by the overlapping of the bottom of the 3d-conduction band with the top of the “impurity band”, but the conclusive result must be obtained from the measurements of Hall coefficients and electrical resistivities.