Abstract: A cassette type audio signal recording apparatus comprising a recording detection sensor for generating a predetermined detection output as a recording button is pressed, a recording head for converting the applied magnetic signal to an electric audio signal and outputting the converted signal, an A/D converter for converting the audio signal output from the recording head to a digital signal, a memory for recording digital type audio data, a recording controller for controlling the encoding of the digital data converted by the A/D converter based on the detection output generated by the recording detection sensor and for storing the encoded data in the memory, and a power supply portion for supplying power to each of the components, wherein the outer shape thereof has the same size and shape as that of a cassette tape.