To provide a surface-mounted filter having a high-frequency gain jumping circuit mounted together with a circuit, e.g. a Bessel low-pass filter, etc., on the surface of the same board, and to provide an optical signal receiver provided with the same.

On a circuit chip board 10, a high-frequency gain jumping circuit and its input/output lines are formed to form correcting capacitance electrodes Cw, made to be independent of input/output lines So and the high-frequency gain jumping circuit. On a package board 11, input/output pads P are formed and connected to the input/output lines So, and to the capacitance electrodes Cw via wires or ribbons.