A demodulation apparatus includes an A/D converter for sampling and quantizing a baseband signal, and a demultiplexer for multiple-separating output signals of the A/D converter into two outputs. A first branch unit splits one of the two outputs of the demultiplexer into M outputs, where M is an integer equal to or greater than 2. Also, M/2 delay units delay M/2 outputs of the first branch unit. A second branch unit splits the outputs of the demultiplexer into M. The demodulation apparatus further includes first M/2 transversal filters, second M/2 transversal filters, and third M transversal filters. First M/2 adders each adds one of the output signals of the first transversal filters and one of the output signals of the third transversal filters, and second M/2 adders each adds one of the output signals of the second transversal filters and one of the output signals of the third transversal filters. A parallel-structured decision point determination unit selects one output from respective outputs of the first M/2 adders and the second M/2 adders. A selector outputs only the output of the adder that is selected by the parallel-structured decision point determination unit, and a decision unit makes a decision based on the output of the selector.