Tokachidake volcano is a volcano group consist of many basaltic or andesitic volcanic edifices, located at the center of the Hokkaido, Japan. The volcano has been created by almost 3 stages: the Old, the Middle and the New. The highest point of the volcano is a lava dome created at the last term of the Middle stage, and the Ground crater, the central volcanic cones, the Suribachi volcanic cones and so on have been created at northern-western side of the point at the New stage. Fumarolic activities have vigorously occurred at the old crater, the Taisho crater created by the 1926 eruption, and the 62-2 crater created by the 1962 eruption. Main activity of the volcano is a creation of remarkable ash plumes and/or lava flows which are characteristics of a strombolian or a sub-plinian eruption. Collapse of volcanic edifices occasionally occurred. A mudflow caused by a snow melting tends to occur if an eruption occurred at a snowfall season.