A health administration apparatus 10 is provided, which is capable of dispensing with a troublesome measuring operation such as to wrap a tape measure or the like around a part of concern of a human body by automatically finding the abdominal circumference (waist size) or the lumbar circumference (hip size) of a human body. The health administration apparatus 10 is configured to allow entry of body data of an examinee, including the height and weight of the examinee, and to be capable of finding the abdominal circumference of the examinee which is the circumferential size of a trunk part of the examinee by a computation based on the body data including the height and the weight of the examinee.