Bulb and luminaire

摘要

In a bulb and a luminaire according to one embodiment, plural fins (18) for thermal radiation are provided on the outer circumferential surface of a main body (17) in which a lighting circuit (7) is attached, a light-emitting module (3) is attached to a module attaching section (11) integrated with the front of the main body (17), and a cylindrical section (4) that surrounds the light-emitting module (3) is protrudingly provided on a light extracting side.