noun
joint surety; co-signer; co-maker
Legal term for a person who guarantees a debt jointly and severally with the principal debtor, commonly required for rental agreements and loans in Japan.
アパートを借りるとき、連帯保証人が必要です。
When renting an apartment, a co-signer is required.
If you become a joint surety, you will be obligated to repay the debt.