The present invention relates to a multipurpose expansion board capable of controlling the impedance between each function board by adjusting the length thereof to fit the function board of the shelf, comprising: a function board connector (2) fixed and mounted on a backplane; A connector supporting means (1) on one side of which the functional board connector (2) is mounted and on which elastic projections (1a) are provided; A connector support means (3) provided on the connector support means (1); A connector plate (7) provided with first and second supports (7a, 7b); An extension board connector 8 installed on the first support 7a; A signal jumper portion 11 provided on the connector plate 7; Dummy board connector 12; A signal line (13) mounted on one side of the connector plate (7) and the other side mounted on the connector support base (1); And right and left fastening means (4) sandwiched between the connector supporting means (3), the length of the extension board can be selectively adjusted when the shelves supporting the board are different from each other, There is an effect that can be performed.
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