An exoskeleton for a limb of a user wherein the limb has an upper portion connected to the body of a user and a lower limb portion is provided. The exoskeleton comprises a drive force transmission mechanism drivingly connecting a drive motor having an output axle aligned with the upper limb portion to one of the body portion and the lower limb portion. The drive force transmission mechanism comprises a first gear provided on an upper end of the lower limb portion or on the body portion and a first transfer member extending transverse to the motor axis.
