A lamp (1) comprises: a LED module (10); a lighting unit (30) that powers the LED module (10); an enclosure (40) that has a first housing part (44) that houses positions other than a capacitor (30b1) of the lighting unit (30), and a second housing part (45) that houses the capacitor (30b1) and is formed with engaging concave parts (P1 to P6) on an outer wall; and a base (60) that has engaging convex parts (61a) on an inner wall and that is fixed to the second housing part (45) by engaging the engaging convex parts (61a) to the engaging concave parts (P1 to P6) in a state of being fitted over the second housing part (45). A peripheral wall of the second housing part (45) has a thickness distribution, and the engaging concave parts (P1 to P6) are formed in the positions on the peripheral wall of the second housing part (45), excluding the thinnest positions.
