Vernier motors are attracting attention as direct drive motors without mechanical gears, in order to applied to higher torque. The authors have developed an inner-rotor type vernier motor, applying cores made of the oriented electrical steel sheets to increase efficiency. In this paper, to improve torque characteristics and gear ratios, outer-rotor type structures, which can be easily multi-polarized, are employed. The motor topologies and torque characteristics are investigated by using the finite element method. As a result, it was found that, unlike the conventional inner-rotor types, the outer-rotor types showed higher average torque, by using the distributed windings and stator modular constructions. As for the model applied the eleventh harmonic revealed 2.5 times higher torque in comparison with the basic model with the fifth harmonic.