An authentication multiple key agreement protocol allows the users to compute more than one session keys in an authentication way. In the paper, an identity-based authentication multiple key agreement protocol is proposed. Its authentication part is proven secure against existential forgery on adaptively chosen message and ID attacks under the random oracle model upon the CDH assumptions. The session keys are proven secure in a formal CK security model under the random oracle model upon the CBDH assumptions. Compared with the previous multiple key agreement protocols, it requires less communication cost.