A lighting lamp 1 using LED lamps as a light source can include a delay circuit 5, a power supply control unit 6, and a timer circuit 7. The delay circuit 5 can be configured to cause the luminous intensity of the LED lamps to rise along a predetermined slope upon turning on the lighting lamp. The power supply control unit and the timer circuit can be configured to cause the luminous intensity of the LED lamps to fall along a predetermined slope which has an inflection point P at a predetermined time point along the slope.