A metal halide lamp

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A metal halide lamp includes a translucent air tight vessel 1 having a light emitting tube portion 11, in which a discharge space 13 is formed, and sealing portions 121, 122 formed on both sides of the light emitting tube portion 11. A discharge medium is enclosed in the discharge space 13 containing at least metal halide and rare gas. A pair of electrodes 31, 32, one ends of which are sealed at sealing portion 121, 122 and the other end of which are arranged in the discharge space 13 facing to each other. The discharge space 13 has a nearly circular shape in a cross section perpendicular to the tube axis and has a structure in which the discharge medium 14 is accumulated between the pair of electrodes 31, 32. The light emitting tube portion 11 is so formed as the wall thickness of a lower portion is thinner than that of an upper portion. The metal halide lamp is obtained having a high luminous efficiency, a quick rise of light flux and an easy manufacturing ability without less bad influence on lamp characteristics.