Legal/financial term for a person or entity obligated to guarantee repayment or redemption.
Under this contract, the guarantor guarantees the payment.
保証人 is a more general term for a guarantor or surety, while 償還義務者 specifically refers to an obligor for redemption or repayment, often in financial contexts.
Compound of 償還 (redemption, repayment) + 義務者 (obligor, person with a duty).