To provide a biological information measuring instrument with which taken calorie is known and a meal menu preparation system capable of preparing an optimal meal menu for a family.

In the biological information measuring instrument provided with a blood glucose level measuring means 21 for measuring a blood glucose level of a patient, an arithmetic controller 30 estimates the calorie taken by the patient from pariodical change of the blood glucose level measured by the blood glucose level measuring means 21 and displays this estimated calorie on a display part 20.