The exotic decay process of β-delayed fission (βDF) has been studied in the neutron-deficient isotope 230 Am. The 230 Am nuclei were produced in the complete fusion reaction 207 Pb(27 Al,4n) 230 Am and separated by using the GARIS gas-filled recoil ion separator. A lower limit for the βDF probability P βDF (230 Am) > 0.30 was deduced, which so far is the highest value among all known βDF nuclei. The systematics of βDF in the region of 230 Am will be discussed.