A split-flow-type flowmeter in which an end portion of a flow splitter tube 1 is inserted into a main-flow pipe 10 having a diameter D. The apparatus comprise a strap including a substrate with an integrated circuit contained therein. When the sheets are stacked, a swing regulating portion 12 regulates the swing of the auxiliary tray 1 when the tray 2 is in a sheet stacking position and releases the regulation of the swing of the auxiliary tray 1 when the tray 2 is lifted. The mount is mounted on the circuit board and covers the at least one connector.