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The present invention relates to a spirulina bead, a manufacturing method of the spirulina bead, a heavy metal adsorbent comprising the spirulina bead, and a rare-earth metal adsorbent comprising the spirulina bead; and to a chlorella bead, a manufacturing method of the chlorella bead, a heavy metal adsorbent comprising the chlorella bead, and a rare-earth metal adsorbent comprising the chlorella bead.