To provide an overtime management device, an overtime management method, and an overtime management program that can automatically allocate and manage overtime hours between weekdays and holidays when overtime hours exceed a predetermined amount. [Solution] The overtime management device of this embodiment includes a calculation
processing means that, for each employee, from the start date to the end date of the attendance closing period, a working day, a day of the week, a work category specifying weekdays or holidays,
working hours, overtime hours calculated based on
working hours, cumulative overtime hours accumulated from the accumulated overtime hours, and, if the cumulative overtime hours exceed a predetermined time, a determination of whether the overtime hours were on weekdays or holidays, and cumulative overtime hours exceeding weekdays, which are accumulated from the overtime hours on holidays included in the portion of the cumulative overtime hours exceeding the predetermined time, which are accumulated from the overtime hours on holidays included in the portion of the cumulative overtime hours exceeding the predetermined time, to create
work performance data.