JENDL Activation Cross Section File for Nuclear Decommissioning 2017 (JENDL/AD-2017) is designed to meet the needs of radioactive inventory evaluation on decommissioning of nuclear facilities. This file provides the data of neutron-induced nuclear reactions (except for Fe-56 for proton incident one): total production cross sections (MF3) of radioactive and stable nuclides, branching ratios (MF9) and partial production cross sections (MF10) for the ground and isomer states of nuclides. The total 311 nuclides have been selected, since their nuclear reactions produce 221 nuclides which are important for dose and clearance evaluations. The energy range of incident neutron (proton) is from 1.0e-5 eV (1 MeV) to 20 MeV. The pointwise data are made at temperatures of 0 K and 293.6 K. In addition, the other file expressed by MF10 instead of MF9 is prepared so as to generate an ACE-format file by the NJOY code.