Aboard edge connector to which a board is inserted along an oblique direction relative to its fixed posture and is pressed to be fixed toward the fixed posture, the connector comprises: a main body; and a plurality of contacts arranged in juxtaposition on the main body along a direction perpendicular to an insertion direction of a board; the contacts include contact portions projecting from the upper face of the main body; the main body includes a base portion supporting the contacts and arm portions that extend forwardly from the opposed lateral faces of the base portion along a lateral edge of the board assuming the fixed posture; and each arm portion includes: a fixed posture retaining portion which is projecting inwards from the upper side of the arm portion and which comprises a lower face contacting the lateral end portion of the upper face of the board for retaining the board under the fixed posture, a withdrawal restricting portion for restricting withdrawal of the board along a direction parallel with the board under the fixed posture, characterized in that the connector comprises: an elasticity mechanism provided at the forward end of the arm portion and extending inwards from the lower face of the arm portion and which is elastically deformed when coming into contact with a lower face of the board assuming the fixed posture in the pressing direction. a main body; and a plurality of contacts arranged in juxtaposition on the main body along a direction perpendicular to an insertion direction of a board; the contacts include contact portions projecting from the upper face of the main body; the main body includes a base portion supporting the contacts and arm portions that extend forwardly from the opposed lateral faces of the base portion along a lateral edge of the board assuming the fixed posture; and each arm portion includes: a fixed posture retaining portion which is projecting inwards from the upper side of the arm portion and which comprises a lower face contacting the lateral end portion of the upper face of the board for retaining the board under the fixed posture, a withdrawal restricting portion for restricting withdrawal of the board along a direction parallel with the board under the fixed posture, characterized in that the connector comprises: an elasticity mechanism provided at the forward end of the arm portion and extending inwards from the lower face of the arm portion and which is elastically deformed when coming into contact with a lower face of the board assuming the fixed posture in the pressing direction. a fixed posture retaining portion which is projecting inwards from the upper side of the arm portion and which comprises a lower face contacting the lateral end portion of the upper face of the board for retaining the board under the fixed posture, a withdrawal restricting portion for restricting withdrawal of the board along a direction parallel with the board under the fixed posture, characterized in that the connector comprises: an elasticity mechanism provided at the forward end of the arm portion and extending inwards from the lower face of the arm portion and which is elastically deformed when coming into contact with a lower face of the board assuming the fixed posture in the pressing direction.