Abstract: Disclosed is a ceiling recessed-type lamp unit, which is capable of facilitating recessedly mounting a unit body to a ceiling, in a reliable manner regardless of a lamp unit's size. The lamp unit comprises a support member 3, and an engagement member 4. The support member 3 is formed with a latch portion adapted to engage the engagement member 4, and a guide groove successively extending from the latch portion downwardly. The engagement member 4 is formed with a first engagement portion 4a engageable with the latch portion, and a second engagement portion 4b engageable with a back surface of a ceiling T. The engagement member 4 is adapted to be rotated in a first direction about a vertical axis thereof, so that the first engagement portion 4a is latchedly engaged with the latch portion to allow the engagement member 4 to be set in a non-engagement position where the second engagement portion 4b avoids engagement with the back surface of the ceiling T.

Abstract: Disclosed is a lamp unit 10 which comprises a hat-shaped reflector 2 having an inner surface formed as a reflective surface for reflecting light, a plurality of bar-shaped light source lamps 1 each of which has an anchor end fixed to a vicinity of an end wall 2a of the reflector 2, and an insertion portion inserted inside the reflector 2 to protrude toward an opening of the reflector 2, and a reflection member 3 having an outer surface formed as a reflective surface. The reflection member 3 is disposed in a central region of the end wall 2a of the reflector 2 in such a manner to protrude toward the opening of the reflector 2. In the lamp unit, a protrusion length “d1” of the reflection member 3 is set in the range of one-third to three-fourths of a protrusion length “d2” of the insertion portion of each of the bar-shaped light source lamps 1.