Bonchari is an electoral constituency in Kisii County. It is one of nine constituencies in the county. The constituency was established for the 1988 elections. It has four wards namely; Riana, Bomorenda, Bomariba and Bogiakumu.
Bonchari Constituency has four wards represented by Members of county assembly in the Kisii County government. The wards are: Bogiakumu, Bomariba, Bokeira (Bomorenda) and Riana.
Kisii South Sub-county shares common boundaries with Bonchari. The Sub-county is headed by the sub-county administrator, appointed by a County Public Service Board.