a contact composite body fabricated from a flat, electrically-conductive panel member extending along and about an X-axis, a Y-axis and a Z-axis perpendicularly intersecting one another to form a Cartesian coordinate system, the X-axis and the Y-axis defining an XY plane, the Y-axis and Z-axis defining a YZ plane and the X-axis and the Z-axis defining an XZ plane, the contact composite body including:

a main body part extending in the YZ plane;

first elastic pieces which extend upwardly from the main body part and elastically contacts with a terminal disposed at an end part of a fluorescent tube, the first elastic pieces extending parallel to the XZ plane; and

second elastic pieces which extend transversely and perpendicularly from the main body part and elastically contacts with a conductive pattern which is formed on at least one of a front surface and a back surface of a circuit board, the second elastic pieces extending parallel to the XZ plane,

wherein the main body part, the first elastic pieces and the second elastic pieces are formed as one integrated part by a single member,

the second elastic pieces are one or more pairs of second elastic pieces, and

one pair of second elastic pieces are capable of pinching the front surface and the back surface of the circuit board.