We have developed a traveling small capsule, which has a smooth outer surface and is driven by inertia force and friction force. Measuring only 11 mm in diameter and 24 mm in length, it is sufficiently small to be placed in the human gullet or intestines. The capsule contains a small magnet, a coil, batteries and a circuit, and an electric pulse drives the magnet to move the capsule. Our capsule may be useful for medical treatments such as inspection and drug delivery.