Fluorescent luminous tube having specific support structure for wire shaped member

A fluorescent luminous tube, which includes a vacuumed envelope having two base members, an anode installed inside the vacuumed envelope, and a cathode arranged inside the vacuumed envelope, the fluorescent luminous tube comprising:

• a first and a second metal layer formed on one of the two base members;
• wire shaped member mounted inside the vacuumed envelope;
• and
• a first and a second spacer, made of a metal, for supporting the wire shaped member at a predetermined height with reference to said one of the two base members,
• wherein one end portion of the wire shaped member is wound around the first spacer to be supported at the predetermined height and is interposed between the first spacer and the first metal layer to be fixed thereto, and
• the other end portion of the wire shaped member is supported at the predetermined height by the second spacer and is fixed to the second metal layer.