Method of collecting nucleic acid

A method of collecting a nucleic acid(s) from a body fluid sample, the method comprising:

• step a) mixing a chaotropic agent and an aluminum oxide support with a water-soluble neutral polymer adsorbed on a surface of the aluminum oxide support with a solution containing a nucleic acid(s), and adsorbing the nucleic acid(s) to the support;
• step b) separating the support on which the nucleic acid(s) is/are adsorbed from the solution mixed at step a);
• step c) mixing the support separated at step b) with a solution containing 0.1 wt % to 2 wt % of an anionic surfactant;
• step d) separating the support on which the nucleic acid(s) is/are adsorbed from the solution mixed at step c);
• and
• step e) adding an eluent to the support separated at step d) and collecting the nucleic acid(s).