PROBLEM TO BE SOLVED: To provide a blood sugar level management device capable of changing blood sugar section information on a blood sugar level at that time while maintaining a past history, and blood sugar level management method.SOLUTION: The blood sugar level management device 20 includes a display section 21 for displaying information. Information on blood sugar measured by a blood sugar measurement device 10 is displayed on the display section together with the blood sugar section information (b) for sectioning the blood sugar information. When a range of the blood sugar section information is changed, application time information of the blood sugar section information after the change can be additionally input into the blood sugar section information after the change. The application time information is stored by being associated with the corresponding blood sugar section information after the change. The blood sugar section information after the change is displayed on the display section on the basis of the corresponding application time information.
