To provide a roast cuttlefish arm enabling automatic weighing at a definite weight and the following bagging with an automatic packaging machine, having the unique taste and palatability of roast cuttlefish arm, easy to eat and storable over a long period without generating drip in the bag.

Boiled cuttlefish arms are cut to arbitrary size, the cut arms are immersed in a seasoning liquid composed mainly of a sugar and salt and roasted to a water content of 45-55%, the roast cuttlefish arm is separately frozen, the separately frozen arm is weighed by automatic weighing and packaged by hermetic sealing introducing nitrogen gas into the package, and the hermetically sealed roast cuttlefish arm is subjected to pressurized hot sterilization treatment to obtain the food.