A hedge trimmer includes elongated upper and lower blades overlapping relative to each other, each of the blades including a trimming portion having an outer periphery formed with a plurality of trimming edges and a mounting portion formed with a guiding hole upper and lower eccentric wheels that extend into the guiding holes of the blades and that is formed with an eccentric hole respectively and a brushless motor including an output shaft extending into and operably coupled with the eccentric holes in the eccentric wheels such that activation of the motor results in rotation of the eccentric wheels within the guiding holes in the blades, thereby driving the blades reciprocally relative to each other along their longitudinal direction.
