Provided are a crack information detection device, a method of detecting crack information, and a crack information detection program capable of accumulating a manual editing history with respect to an automatically detected damage to improve detection accuracy of a crack. It is assumed that a delete flag “1” of a damage vector (C5-2) is recorded in hierarchical structure information by completion of a delete operation with respect to the damage vector (C5-2). In the case, in a case where the number of operations or an operation time required for the completion of the delete operation is equal to or larger than a predetermined threshold value (for example, click ten times or more, drag and drop five times or more, or ten minutes or more from the start to the end of the editing operation), threshold values of an angle α1 and an angle α2 are reduced by a predetermined amount.