A　magnetic　molecularly　imprinted　silica　solid　was　obtained　by　sol-gel　polymerization　for　the　separation　of　domoic　acid.　The　solid　showed　rapid　adsorption　kinetics　with　an　adsorption　equilibrium　time　of　5　min.　The　solid　showed　affinity　to　domoic　acid　under　the　interference　of　tryptophan　and　could　be　repeatedly　used　for　5　times　at　least.　The　solid　was　used　as　a　solid-phase-extraction　sorbent　for　the　extraction　of　domoic　acid　from　clam　samples　before　measurement　with　liquid　chromatography.　The　detection　limit　of　0.20　mg　kg(-1)　was　lower　than　the　allowable　limits　in　several　countries　or　areas.　The　recoveries　in　the　spiked　samples　were　88%　approximately.