The street protest action that crowded and was called "Sound demonstration (Sound Demo)" by young people during for several years came to be shown in the city in Japanese various places. The marcher dances the road, it walks, and this is a demonstration of the track where the sound speaker and machine parts for DJ were piled up to the head though this is a sink because of a large sound as for the dance music. This thesis pays attention to this sound demonstration that appeared in a Japanese society in recent years, and examines it as "Festival" or "Urban Festival". The sound demonstration starts sending the political expression in a festivity dimension. However, because it violates and disturbs the boundary of the festival and the demonstration, the police overreaction might be invited, and the boundary of the festival and the demonstration be made visible. However, intentional use of the festivity also gives birth also to the strategy that opposes the enclosure of such a festivity. That is, it is concluded that "Festivity as the strategy" is a device thought out to make the situation advantageous by reading the combat rule of demonstration that rules the scene of the action directly in a different way in this thesis.

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