To provide a work hour accumulating device capable of accurately accumulating work hours with a simple operation and performing long-term management even up to monthly and yearly long-term management.

An operation picture displaying means 4 displays an operation picture for accumulating work hours, and when the files of a work section and a job section to be worked do not exist, a file preparing means 3 prepares a file for work hour accumulation by individuals on the basis of individual information. A work hour accumulating means 9 adds up work hours in each work section or job section of a job designated through the operation picture and stores the added up hours of each section in the file for work hour accumulation at the end of the work of one day. Thus, working hours of each job type are discriminated and accumulated in the work hours of the day.