The pure rotational spectra of MgNC in the nu(2) (bending) vibrationally excited states were observed in the 310-380 GHz region to study the linearity of the molecule. The observed 90 spectral lines were assigned to the transitions in the nu(2)=1-5 states and analyzed to determine a set of molecular constants in each state. The bending vibrational frequency was estimated to be 86 cm(-1) from the l-type doubling constant of the nu(2)=1-5 state. The interval of the Phi and Pi states in nu(2)=3 was determined to be 29.2280(24) cm(-1), giving the anharmonicity constant x(ll)=3.8611(9) cm(-1) with one standard deviation in parentheses, which indicates that the molecule has a linear form. However, somewhat peculiar properties were recognized in dependence of the observed I-type resonance and vibration-rotation constants on the nu(2) vibrational quantum number, suggesting an effect of anharmonicity.