PURPOSE:To eliminate the need for a special shaped exhaust tube and make mounting parts common in the opposed both ends and bending section of a luminous tube by bending and molding both ends toward the diametrical outside of an annular section that is bent annularly. CONSTITUTION:Both ends 12 and 12 and bending section 17 that are close to each other and opposed are bent toward the diametrical outside of the respective annular sections 18 and 18. Therefore, both the ends 12 and 12 and the bending section 17 are almost in parallel on the same level as a plane containing the annular sections 18 and 18. As a result, since the sealing end face of both the ends 12 and 12 and the bending section 17 are not opposed to each other, an exhasut pipe 19 need not be bent just in front of the bending section 17 as before. Besides, the special shaped exhaust pipe 19 is not required and the common use of mount 13 parts is enabled and then cost reduction can be achieved.
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