To accurately measure biological information depending on the range of arrival of measuring current.

An electrode E1 and an electrode E2 are disposed with a distance D12 in-between. An electrode E3 and an electrode E4 are disposed with a distance D34 in-between between the electrode E1 and the electrode E2. A motion control part 44 switches the mode to a first measuring mode for distributing the measuring current I between the electrode E1 and the electrode E2 and detecting measuring voltage V between the electrode E3 and the electrode E4, or to a second measuring mode for distributing the measuring current 1 between the electrode E3 and the electrode E4 and detecting the measuring voltage V between the electrode E1 and the electrode E2. An information generating part 42 calculates a fat rate F according to the measuring current I and the measuring voltage V in the first measuring mode, and calculates a subcutaneous fat thickness Lf according to the measuring current I and the measuring voltage V in the second measuring mode.