PROBLEM TO BE SOLVED: To provide a biological information monitor capable of prompting a medical worker to make an appropriate and quick determination on a symptom.SOLUTION: A biological information monitor 100 includes a trend graph formation part 105 for forming a trend graph concerning a plurality of pieces of biological information, and a display part (a display control part 106, and a display 107) for displaying two or more trend graphs concerning different parameters of a plurality of trend graphs formed by the trend graph formation part 105 on the same coordinates in an overlapped manner so as to prompt a medical worker to make an appropriate and quick determination on a symptom.