PURPOSE: A complex micro-pile is provided to improve support force on the load of compression or tension by including a tread bar embedded under the ground more deeply than the end of a front end of a helical pile. CONSTITUTION: A complex micro-pile comprises a helical pile(100) and a tread bar(200). The helical pile comprises a pile main body and a helix part(120). The helix part is formed of a first helix(121) and a second helix(123). The pile main body is classified into a front end part(111) contacting the ground and a rear end part corresponding to the front end part. The first helix is formed to be near the front end part. The second helix is formed to be spaced from the first helix. The tread bar is embedded under the ground more deeply than the end of the front end part.
