Patent ID: 8794794

Claim:
A lamp unit comprising: a base member; a light source mounted on one surface side of the base member; a cap mounted on the other surface side of the base member and formed with a cap projection having a flat portion at a center portion thereof; and a lighting circuit having a lighting circuit substrate arranged in the cap with one surface facing the flat portion of the cap projection and lighting circuit components mounted on the one surface of the lighting circuit substrate and arranged within the cap projection, in which a clearance between the lighting circuit substrate and the flat portion of the cap projection is larger than the height of a component projecting most from the lighting circuit substrate from among the lighting circuit components, wherein the lighting circuit substrate includes a ground potential pattern, a stable potential pattern, and a high-frequency power supply pattern, and the high-frequency power supply pattern has a clearance from the flat portion of the cap projection larger than the ground potential pattern or the stable potential pattern.