隐存保证背书在形式上构成回头背书时，被背书人得以存在保证关系为由，要求其作为背书人时的后手承担票据责任。
When hidden guaranty endorsement composes turning round endorsement in form , the endorsee can ask the successor as endorser to undertake the bill duty for the cause of existing guaranty relation .
回头背书