Lamp unit and illumination apparatus

摘要

According to one embodiment, a light source (38) is mounted on one side of a base body (17), a cap (20) is mounted on the other side of the base body (17) and a lighting circuit (21) is mounted in the cap (20). In the cap, a circumferential portion (51) is formed, and a projection portion (53) being projected from the other side of the circumferential portion (51) and having an inner space opened to the one side is formed. The lighting circuit (21) has a substrate (88) and a plurality of components (89) mounted on the substrate (88). The components include a first component group (89a) mounted on a center portion of the substrate (88) and having a height stored in the projection portion (53) and a second component group (89b) mounted on a peripheral portion of the substrate (88) and having a smaller height stored in the circumferential portion (51).