Patent ID: 8351217

Claim:
A wiring board comprising: a device zone including a plurality of device formation areas; a frame including a mold area surrounding the device zone and a clamp area surrounding the mold area, the clamp area including first and second sides opposed to each other, and third and fourth sides opposed to each other, the clamp area to be sandwiched between molding dies when the device zone and the mold area are places in a cavity of the molding dies to form a sealant to collectively cover the device zone and the mold area; a plurality of first slits provided adjacent to the first side in the clamp area, each of the first slits including a longitudinal extending along the first side; a plurality of second slits provided adjacent to the second side in the clamp area, each of the second slits including a longitudinal extending along the second side; a plurality of third slits provided adjacent to the third side in the clamp area, each of the third slits including a longitudinal extending along the third side; and a plurality of fourth slits provided adjacent to the fourth side in the clamp area, each of the fourth slits including a longitudinal extending along the fourth side, wherein the first, second, third and fourth slits are not filled with the sealant when the device zone and the mold area are sealed with the sealant.