(57) A tubular lamp includes a tubular bulb (10). A plurality of coiled filaments (20)
and short-circuit wires (22) are alternately arranged in the bulb, along the axis
of the bulb. Each filament is coiled into a predetermined inner diameter, and has
a luminant section (20a), and engagemert sections (20b) located at both ends thereof.
Each short-circuit wire has a lower hardness than the filament and a large r diameter
than the inner diameter of the filament. The short-circuit wire has an insertion portion
(22a) which is screwed ,nto the engagement section of the corresponding filament
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