Wiring board and method of manufacturing wiring board

A method of manufacturing a wiring board comprising:

• forming a base substrate;
• forming a first insulation layer on a first surface of the base substrate and a second insulation layer on a second surface of the base substrate opposing the first surface;
• forming a first insulation layer on a first surface of the base substrate and a second insulating layer on a second surface of the base substrate opposing the first surface;
• forming at least one via in at least one of the first or second insulation layers;
• and
• cutting the first insulation layer in a first area and cutting the second insulating layer in a second area offset from said first area, to form a first substrate laminated to a second substrate with the base layer interposed therebetween the second substrate having a smaller mounting area than a mounting area of the first substrate such that the first substrate extends beyond an edge of the second substrate wherein a thickness of a portion of the base substrate that is not sandwiched between the first substrate and the second substrate is cut to be thinner than a portion of the base substrate sandwiched between the first substrate and the second substrate.