METAL HALIDE LAMP AND LIGHTING DEVICE USING THIS

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A light emission tube (3) comprising a cylinder unit (16) having an inner diameter of at least 5.5 mm, a thin tube portion (18) formed at the opposite ends of the cylinder unit (16) via a connection potion (17), a translucent ceramic enclosure (19) having at least rear-earth halogen compound sealed thereinside, and electrode introducing elements (24), (25) inserted and sealed in the thin tube portion (18). An angle α formed by the linear portion of the inner surface of the cylinder unit (16) and the linear portion of the inner surface of the connection portion (17) on the section of the light emission tube (3) formed along a plane including the center axis X in the longitudinal direction of the light emission tube (3) is 85°-115°. A gap (26) is formed between the thin tube portion (18) and the electrode introducing elements (24), (25). The radius of curvature of the inner surface of the boundary (20) between the cylinder unit (16) and the connection portion (17) is 0.5mm-2.5mm.