Abstract: An electromagnetic flowmeter for measuring the flow rate of electrically-conductive fluids through a conduit. A magnetic field generating device has a U-shaped iron core with a gap between the ends thereof and a coil on the core energizable to produce a magnetic field across the gap. A boxlike body of molded resin has a bottom wall and side walls with the iron core and coil enclosed in the central portion thereof. The body extends along the axis of the conduit and receives the conduit removably but snugly between the side walls thereof. The bottom wall of the body is spaced below the conduit by an electrode receiving space and a substantially diametrially opposed pair of electrodes enter the conduit within the gap along a line substantially at right angles to the magnet field across the gap. The boxlike body has end walls with upward facing depressions supporting portions of the conduit axially spaced in opposite directions from the electrodes. Clamping members clamp the conduit in the end wall depressions.