Abstract: A container shaking device especially for use in shaking nail polish containers includes a container holding portion mounted on a pivotal arm. An elongated reciprocal bar has a first end secured for pivoting the pivotal arm and has an elongated slot formed adjacent an opposite end. A rotary arm has a transverse pin received in the slot on the reciprocal arm and is connected through a plurality of gears for rotation by an electric motor. The container holder includes an L-shaped portion having a first leg secured to the pivotal arm and a clamping member mounted for sliding movement on the first leg member in parallel relation with a second leg member. A spring biased clamping pin is utilized for securing the clamping member in adjusted position for securing various different sizes of containers.