Semiconductor light-emitting device, and water disinfection device

A semiconductor light-emitting device comprising:

• a substrate;
• a semiconductor light-emitting element that is mounted on the substrate;
• and
• a dome-shaped transparent body that is mounted on the substrate,
• wherein:
• the dome-shaped transparent body includes a convex lid portion that covers a space around the semiconductor light-emitting element and includes an annular base portion and a flange portion that projects to an outer side of an outer peripheral edge of the annular base portion,
• a first bonding pattern made of metal that surrounds the semiconductor light-emitting element is formed on the substrate,
• a second bonding pattern having a shape corresponding to the first bonding pattern is provided in the base portion and the flange portion of the dome-shaped transparent body,
• the first bonding pattern and the second bonding pattern are bonded to each other via solder, to seal the space in the convex lid portion, and
• the first bonding pattern and the second bonding pattern have rectangular ring shapes that surround the semiconductor light-emitting element when viewed from above, at least edges on inner peripheral sides of corner portions thereof are positioned on outer sides of outer peripheral edges of the annular base portion of the convex lid portion, and at least edges on inner peripheral sides of straight-line portions sandwiched between the corner portions are positioned closer to the semiconductor light-emitting element than the outer peripheral edge of the annular base portion of the convex lid portion.