The present invention provides a junction block adapted for a variety grade of vehicles without increase of cost. The junction block includes a circuit board 2, a terminal block 3 for low-grade use to be connected to the circuit board, a bus bar block 4 for high-grade use superimposed on the terminal block and connected to the circuit board, a cover 9 for covering the circuit board from side of the bus bar block, and a plurality of fuses 39, 39′ to be connected to terminals 14a, 19a of the terminal block and the bus bar block, wherein the junction block is adapted for high-grade use and low-grade use with or without use of the bus bar block.