The present invention provides a high-pressure discharge lamp 100 including a luminous bulb 10 enclosing at least a rare gas and halogen in the bulb and made substantially of quartz glass; and an electrode 12 made substantially of tungsten and disposed in the luminous bulb. The IF circuit section supplies electric power to an outside IF part during the ON interval, and receives some communication data from the outside. The side wall has, at the bore, a recessed zone whose concavity is oriented toward the outside of the housing, the ledge intended to receive the screw overhanging the recessed zone. Information represented by the match granule and the structure granules is summarized to form a rough value.