The present invention provides a board fixing device not having an arm portion along a side edge of a
printed circuit board. In a connector having spring contacts forming a contact point row in a direction perpendicular to the
insertion direction of a board, when one end of said board is rotated in a direction whereby the spring contacts are pressed while being put into contact with the said spring contacts, during the
insertion of the
printed circuit board into said connector, and the other end of the opposing
printed circuit board is made to approach said board fixing device, a printed circuit board having a corresponding notched portion on its edge portion engages a stabilizing piece formed in a
perpendicular direction from one surface of the base portion, and at the same time, engages a protruding portion protruding from said base portion, and is fixed against the driving force of the said spring contacts. Whereby, shaking or swinging in the horizontal direction relative to the
motherboard are restricted due to the protruding piece, and shaking and swinging in the vertical direction relative to the
motherboard are restricted due to the engaging of the protruding portion of the said base portion and the said other end portion of the printed circuit board.