A light-emitting device, comprising: a high-pressure discharge lamp having: a light-emitting portion having therein a pair of main electrodes opposed to each other; and sealing portions extending outward from the light-emitting portion; a bowl-shaped reflector having: an insertion hole which is formed in a bottom portion and in which one of the sealing portions of the high-pressure discharge lamp is inserted; an inner space in which the high-pressure discharge lamp is accommodated with the one sealing portion inserted in the insertion hole; and a reflection surface which is formed on an inner surface of the reflector and which reflects light from the high-pressure discharge lamp; an auxiliary lamp having a cylindrical discharge container and an ultraviolet ray emitting space in which ultraviolet rays are generated; a current-carrying wire which is connected to an external lead rod protruding from the other sealing portion opposite to the sealing portion inserted in the insertion hole, which is inserted in the insertion hole, and which is wound around an outer surface of the discharge container of the auxiliary lamp to form an external electrode; and a base attached over an outer surface of the bottom portion of the reflector and having formed therein an accommodation space in which the auxiliary lamp is accommodated between the bottom portion and the base, wherein a thickness (t) of the bottom portion of the reflector in which the insertion hole is formed is set to be small such that an outer end portion of the sealing portion inserted in the insertion hole projects through the insertion hole into the accommodation space of the base, and such that the entire ultraviolet ray emitting space of the auxiliary lamp is located along a side surface of the sealing portion and in front of the entire periphery of the sealing portion in a manner in which a central axis of the ultraviolet ray emitting space and a central axis of the sealing portion are parallel to each other and wherein the entire ultraviolet ray emitting space is accommodated in the accommodation space. a high-pressure discharge lamp having: a light-emitting portion having therein a pair of main electrodes opposed to each other; and sealing portions extending outward from the light-emitting portion; a bowl-shaped reflector having: an insertion hole which is formed in a bottom portion and in which one of the sealing portions of the high-pressure discharge lamp is inserted; an inner space in which the high-pressure discharge lamp is accommodated with the one sealing portion inserted in the insertion hole; and a reflection surface which is formed on an inner surface of the reflector and which reflects light from the high-pressure discharge lamp; an auxiliary lamp having a cylindrical discharge container and an ultraviolet ray emitting space in which ultraviolet rays are generated; a current-carrying wire which is connected to an external lead rod protruding from the other sealing portion opposite to the sealing portion inserted in the insertion hole, which is inserted in the insertion hole, and which is wound around an outer surface of the discharge container of the auxiliary lamp to form an external electrode; and a base attached over an outer surface of the bottom portion of the reflector and having formed therein an accommodation space in which the auxiliary lamp is accommodated between the bottom portion and the base, wherein a thickness (t) of the bottom portion of the reflector in which the insertion hole is formed is set to be small such that an outer end portion of the sealing portion inserted in the insertion hole projects through the insertion hole into the accommodation space of the base, and such that the entire ultraviolet ray emitting space of the auxiliary lamp is located along a side surface of the sealing portion and in front of the entire periphery of the sealing portion in a manner in which a central axis of the ultraviolet ray emitting space and a central axis of the sealing portion are parallel to each other and wherein the entire ultraviolet ray emitting space is accommodated in the accommodation space.