A method of manufacturing a junction box installed in an automobile, said junction box having a main body, which comprises: a first power input circuit; a first output circuit disconnected from the first power input circuit and having at least one of a first electrical device connected thereto; a second power input circuit; and a second output circuit disconnected from the second power input circuit and having at least one of a second electrical device connected thereto, said method comprising: selectively providing the same main body of the same junction box with one of a first cut switch and a second cut switch, the first cut switch being capable of connecting and breaking a connection between said first power input circuit and said first output circuit as well as connecting and breaking a connection between said second power input circuit and said second output circuit, said first cut switch being comprised of a pair of first connectors for connecting the first power input circuit with the first output circuit and the second power input circuit with the second output circuit, respectively; and the second cut switch being capable of connecting and breaking a connection between said first power input circuit and said first and second output circuits (25, 35), said second cut switch being comprised of a single second connector for connecting the first power input circuit with the first and second output circuits (25, 35), wherein said pair of first connectors or said single second connector, respectively, are or is held by a support, wherein each of the pair of first connectors in the first cut switch has one input contact and one output contact, or wherein the second connector in the second cut switch has one input contact and two output contacts (552, 561) connected by a branch link, wherein the main body comprises insertion holes to which a first input switch terminal, a first output switch terminal, a second input switch terminal and a second output switch terminal are provided and wherein either said input contacts and said output contacts of the first cut switch or said one input contact and said two linked output contacts (552, 561) of the second cut switch are inserted into the corresponding insertion holes. a first power input circuit; a first output circuit disconnected from the first power input circuit and having at least one of a first electrical device connected thereto; a second power input circuit; and a second output circuit disconnected from the second power input circuit and having at least one of a second electrical device connected thereto, selectively providing the same main body of the same junction box with one of a first cut switch and a second cut switch, the first cut switch being capable of connecting and breaking a connection between said first power input circuit and said first output circuit as well as connecting and breaking a connection between said second power input circuit and said second output circuit, said first cut switch being comprised of a pair of first connectors for connecting the first power input circuit with the first output circuit and the second power input circuit with the second output circuit, respectively; and the second cut switch being capable of connecting and breaking a connection between said first power input circuit and said first and second output circuits (25, 35), said second cut switch being comprised of a single second connector for connecting the first power input circuit with the first and second output circuits (25, 35), wherein said pair of first connectors or said single second connector, respectively, are or is held by a support, wherein each of the pair of first connectors in the first cut switch has one input contact and one output contact, or wherein the second connector in the second cut switch has one input contact and two output contacts (552, 561) connected by a branch link, wherein the main body comprises insertion holes to which a first input switch terminal, a first output switch terminal, a second input switch terminal and a second output switch terminal are provided and wherein either said input contacts and said output contacts of the first cut switch or said one input contact and said two linked output contacts (552, 561) of the second cut switch are inserted into the corresponding insertion holes.