Harmonica

The present invention provides a harmonica having advanced functions and a simple structure, which can produce three fundamental chords in each of major and minor modes and which can be also used as a chromatic harmonica. The harmonica includes a pair of a blow reed and a draw reed in each of an upper part and a lower part of a hole and has four tone rows of a tone row for the upper blow reeds, a tone row for the upper draw reeds, a tone row for the lower blow reeds, and a tone row for the lower draw reeds. To three of the four tone rows are assigned three fundamental chords that each consist of four notes, and the remaining one tone row is used to supplement a note required to configure the chromatic scale.