The concept of a new linear motor that uses piezo-stack actuator is demonstrated. The working principle is far different from the conventional inchworm motor. This motor is based on the self-moving cell concept. The linear motor has three cells and each cell is constructed with one piezo-stack actuator and a shell structure. A cell train is constructed by connecting these cells and the train is fitted into a giudeway with interference. By activating each cell in succession, the train can move along the guideway. The moving motion of the motor is tested. Since this linear motor uses piezo-stack actuator with unified clamping cell, there is possibility to produce fast speed, high resolution and large push force.