PROBLEM TO BE SOLVED: To produce a processed seed from which a thorn-like construction is reliably removed without damaging the seed itself. SOLUTION: A method for producing a processed seed includes a first treatment step (STEP 10) of at least hardening the thorn-like construction to the seed covered with a husk in which the thorn-like construction presents in the periphery, and a second treatment step (STEP 20) of removing the thorn-like construction from the seed in a first state obtained by the first treatment step. COPYRIGHT: (C)2013,JPO&INPIT