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This paper reports on an evaluation of the adhesion force between silicon and carbon nanotubes (CNTs), which were directly synthesized on a silicon substrate by chemical vapor deposition (CVD). CNTs bridging between silicon tips were pushed with a force-sensing cantilever to break the adhesion between silicon and CNTs. We measured the force acting on the cantilever at the moment of breaking the adhesion between silicon and CNTs. This force was measured to be 28 nN.