It is shown that the taste of seafoods can be expressed by combination of several kinds of amino acids [4]. We studied the taste of sea urchin and synthetic sea urchin using the taste sensor [5]. The sea urchin showed a response pattern of electric potential similar to that of synthetic sea urchin, which is composed of amino acids (glycine, alanine, methionine, MSG), nucleotides (IMP, GMP) and NaCl. The response to synthetic sea urchin became closer to that for sea urchin depending on the configuration of Na.C1 which is a constituent of synthetic sea urchin. The present method provides a new automated method to synthesize the taste of foods and takes the place of human sensory evaluations.