This Japanese national report describes following 8 issues in recent five years (2014-2018), i.e., (1) tuna fisheries (longline fishery and purse seine fishery) (2) fleet information, (3) catch and effort by species and gear, (4) recreational fishery, (5) ecosystem and bycatch, (6) national data collection and processing systems including “logbook data collection and verification”, “vessel monitoring system”, “scientific observer program”, “port sampling program” and “unloading and transshipment”, (7) national research programs and (8) Implementation of Scientific Committee recommendations & resolutions of the IOTC relevant to the Scientific Committee and (9) working documents.