Abstract: A current detecting device has: a bus bar through which a current under measurement flows; a fastening member for fastening an external member to the bus bar; a chassis formed integrally with the bus bar and a shield, the chassis holding the bus bar and fastening member in a mutual contact state; and a magnetic sensor placed so as to face the bus bar, the magnetic sensor being capable of detecting a magnetic field generated when the current under measurement flows through the bus bar. The bus bar has a fastening terminal portion on the same side as an end of the bus bar, the fastening terminal portion being in contact with the external member. A connection surface is provided so as to be exposed from the chassis, the connection surface being a surface through which the fastening terminal portion is brought into contact with the external member.