PURPOSE: To provide an incandescent lamp with an infrared reflecting film high efficient with a long life by preventing generation of a hot spot on a filament so as to uniformly generate an end part temperature.

CONSTITUTION: In an incandescent lamp having a rotary elliptic surface 10 between a chip off part 6 and a seal part 7 of the bulb by providing a filament 3 in the tube axial direction in the inside of the glass bulb 1, infrared unreflecting dimension BB of the bulb is larger than a filament external diameter D, further with a length CL of a filament 0.7 to 0.9 times a distance between focal points 12 of the rotary elliptic surface of the bulb, and the filament is arranged between the two focal points 12.