Recently, relatively large amount of a new species of crab belonging to genus Chionoecetes that has intermediate characteristics between red-tanner crab (Chionoecetes japonicus) and queen crab (C. opilio) was caught the East Sea of Korea. The new species of crab was tentatively named Neodo-Daege. Amino acid and proximate compositions of the edible meat of red-tanner crab and Neodo-Daege were determine. The proximate composition of the meats of Neodo-Daege were $79.2{\%}$ in moisture, $17.4{\%}$ in protein, $0.6{\%}$ in lipid, and $1.5{\%}$ in ash. Neodo-Daege was higher in protein and lipid contents, and lower in moisture and ash contents than those of red-tanner crab. The total amino acid contents in the meat of Neodo-Daege were higher than those of red-tanner crab, but the profile of amino acids was similar to one another. Among amino acids, glutamic acid, arginine, aspartic acid, lysine and glycine were major components of the crabs.