PURPOSE: To provide a method for processing crab legs, capable of quickly cutting the crab legs, not damaging the inner contents of the crab legs, permitting to readily take out the inner contents from the crab legs on the eating of the inner contents, but substantially not causing the falling of the inner contents from the crab legs during their cooking, and further enabling to process the frozen crab legs without deteriorating their freshness, and also to provide the crab leg-cutting device used for the method.

CONSTITUTION: Two cutting lines are formed in the shell of the target side surface 32 of a crab leg 31 at a narrower distance than the width of the crab leg in the longitudinal direction of the crab leg 31, and at a desired time the belt-like shell part 35 nipped both the cutting lines 34 is peeled off.