An object of the utility model is to provide a wiring substrate; and even if lengths of wiring patterns become longer or the widths of the wiring patterns become wider, the wiring substrate can block up holes in the wiring pattern, and heating inhibition becomes easier. The wiring substrate (1) is equipped with a plurality of electronic parts and provided with the wiring patterns (2) for current circulation between the electronic parts, solders of the electronic parts are connected to the wiring patterns (2) through soldering, the wiring patterns (2) are provided with a plurality of long holes (3) along the flow of current, the long holes (3) in the current circulation direction form a first long-hole column (31) and a second long-hole column (32), the second long-hole column (32) and the first long-hole column (31) are arranged side by side, the long holes of the second long-hole column (32) and the continuous long holes of the first long-hole column (31) are oppositely disposed, and the solders (8) are used to block up the long holes of the first long-hole column (31) and the long holes of the second long-hole column (32).