A shaft excavator includes a cutter head including a first head that is supported by a lower end of a cylindrical body that is rotatably supported about its axis, and a first head that has a space portion that passes through in the center in the vertical direction, and that has at least one first position. The shovel teeth are used to excavate the sand on the lower side of the first head and can be disassembled and co-axially disposed above the space from above, and have a cylindrical portion receiving the excavated material excavated by the first shovel teeth and being closed. The second head at the bottom of the tubular portion is provided with at least one second output tooth for digging the sand below the second head, and the second head also has an opening formed at the bottom portion.
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