Patent ID: 7659481

Claim:
A printed wiring board having a multilayer structure with a plurality of approximately rectangular wiring boards having a wiring pattern including a plurality of leads which electrically connect a plurality of electrodes, the wiring pattern comprising: a first electrode including a plurality of pads provided on an upper layer of the approximately rectangular wiring boards; a second electrode including a plurality of through holes formed inwardly relative to the pads and which electrically connect the plurality of approximately rectangular wiring boards; a first lead which linearly connects the first electrode and the second electrode with almost a same width as a width or a diameter of a larger one of the first electrode and the second electrode, the first lead being formed at an angle of approximately 45 degrees to one side of the upper layer of the approximately rectangular wiring boards toward a corresponding corner thereof; and reinforcing pads provided on an outermost area of the printed wiring board, the reinforcing pads having an area greater than that of the second electrode, wherein at least one of the reinforcing pads at a corner portion of the upper layer of the approximately rectangular wiring boards is connected to the second electrode by a second lead which extends linearly, the second lead having a width which is the same as or greater than a width of the second electrode and is inclined at an angle of approximately 45 degrees with respect to the at least one of the reinforcing pads.