Weight management device and biological information monitoring system

A weight management device used in a biological information monitoring system configured to monitor biological information of a subject on a bed, based on a detection value of a load detector configured to detect a load of the subject, the weight management device comprising:

• a housing;
• a display provided at an outer surface of the housing and configured to display a weight of the subject, based on the detection value;
• an attachment portion provided at an outer surface of the housing and attachable to and detachable from the bed;
• an input unit;
• and
• a display control unit configured to control a display content of the display, wherein:
• the biological information monitoring system or the weight management device includes a notification control unit configured to make a notification related to biological information of the subject, based on a comparison between a change amount of a weight of the subject in a predetermined period and a threshold value set by using the input unit;
• the input unit includes a recording button;
• and
• the display control unit:
• stores, in a storage unit a first weight of the subject associated with a first time when the recording button is operated at the first time,
• stores, in the storage unit, a second weight of the subject associated with a second time later than the first time, when the recording button is operated at the second time, and
• displays, on the display, a difference between the first weight and the second weight.