Board-to-board connector

A board-to-board connector to be mounted on a first board and interposed between the first board and a second board to electrically connect a plurality of pads of the first board with a plurality of pads of the second board respectively, comprising:

• a rectangular flat-plate housing including a first positioning hole and a second positioning hole;
• and
• a first contact row and a second contact row held on the housing, wherein
• the housing includes only the first positioning hole and the second positioning hole as positioning holes for positioning the second board with respect to the board-to-board connector,
• the first contact row and the second contact row are disposed to separate from each other in a direction orthogonal to a longitudinal direction of the first contact row,
• the housing includes a first side surface on one side thereof and a second side surface on another side thereof opposite to the one side,
• the first contact row and the second contact row extend from the first side surface to the second side surface,
• the first positioning hole is disposed between the first side surface and the first contact row, and
• the second positioning hole is disposed between the first side surface and the second contact row.