In Japan, the ecological research of big wild mammals including the wild boar is few, mainly because they almost inhabit the forest. But the management of wild animals is important and it concerns creature's resources and conservation of nature, therefore an approach from the applied geographical field is expected.
In order to the enforcement of the effective management, we must understand the ecology of wild animals first. So, the author investigated the ecology of the wild boar from the analysis of digged holes in the Japan cedar plantation with the result as follows; 1) The wild boar digs holes with two types. 2) The major axis, the minor axis and the depth of digged holes correlate from one to another. 3) The wild boar digs out the ground to the low place (67%), the side or the surrounding (26%), the high (7%). 4) Digged holes concentrate on the edge of the forest.
Hereafter, the author expects the heap of these researches for the grasp of the wild boar's ecology and the enforcement of the effective management.