Patent ID: 8174194

Claim:
A discharge lamp, comprising: an emitting portion in which a pair of electrodes are disposed, an electric discharge being generated between the pair of electrodes so as to emit light; at least either one electrode of the pair of the electrodes including: a small-diameter portion, the small-diameter portion extending in a first direction; and a large-diameter portion provided on an end of the small-diameter portion, the end of the small-diameter portion being located close to the other electrode, the large-diameter portion having a larger diameter than the small-diameter portion; and a projecting part projecting in a direction orthogonal to the first direction, the projecting part projecting outward relative to an end of the large-diameter portion that is in the direction orthogonal to the first direction, wherein the projecting part is a circular component that is substantially circular-shaped and mounted on the large-diameter portion, and wherein the circular component includes an opening into which the large-diameter portion is inserted.