Since the shakuhachi bamboo flute is an end-blown flute, the length of its resonance tube is considered to be from the upper part (precisely, the part of Shakuhachi bamboo flute) to the lower part of the tube (the end of tube).
なお、尺八は縦笛であるから、共鳴管の長さは管の上端（正確には尺八）から下端（管尻）までと考える。