The invention relates to a body information obtaining device and a body information obtaining method. The body information obtaining device includes: a sensor unit which has at least one sensor sensing body information and is wearable on any one of a plurality of wearing positions different from each other of the body of a user; and an actually-wearing position identification unit which identifies an actually-wearing position where the sensor unit is worn among the plurality of wearing positions on basis of a sensing result by the sensor unit. The sensor unit is controlled to perform sensing detection on the body information corresponding to a wearing position identified by the actually-wearing position identification unit.