An improved wheelbarrow in a disassembled condition is disposed in a carton that conforms substantially with the orthogonal dimensions of a tray of the wheelbarrow. The actuator further includes an electric field reduction area configured to shield an electric field occurring between the first and second electrodes by the voltage applied therebetween in a portion which lies outside the first electrode on the surface of the vibrating substrate and faces the moving body. The drive and internal portions of the body are adapted to form contact fits.