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An agarase was partially purified from the culture broth of marine bacterium Bacillus cereus ASK202. Optimal pH and temperature of this agarase were found to be 7.0 and 40℃, respectively. The maximum productivity of agarooligosaccharides was obtained from 0.3 %(w/v) agar by using of 1 unit agarase. As the results of TLC and HPLC analysis, these oilgosaccharides consisted of neoagarobiose, neoagarotetraose and neoagarohexaose. Under the optimal reaction conditions, 77.5 %(w/v) neoagarobiose and 6.2 %(w/v) neoagarotetraose were produced from agar and the conversion yield of total agarooligosaccharides was 83.7 %(w/v) after for 2 h reaction at 40℃.