To make the subject device capable of performing log-in by easily understandable data input, to gathering man-hour data, and to easily visibly dividing and displaying work items and operators.

This automatic man-hour sum-up device is provided with a work item detection means 1 for detecting that the work item is inputted with KANA (Japanese syllabary)/KANJI (Chinese character) when inputted with them and performing the log-in, man-hour gathering means 2 for gathering the man-hour for every work item after performing the log-in by the work item detection means until performing log-out, a work result chart generation means 4 for displaying the man-hour for every work item in real time, a man- hour calculation means 3 for summing up the man-hour for every work item, a man-hour division means 5 for dividing the man-hour for every wark item by predetermined identification display and a man-hour display means 6 for displaying the man-hour divided by the man-hour division means.