PURPOSE: To increase a rate of a light flux incident on a surface to be illuminated, and perform illumination excellent in a coefficient of utilization by straining light distribution of an HID floodlight luminaire in both the vertical angle direction and the horizontal angle direction.

CONSTITUTION: A maximum luminous intensity point exists in the optical axis center, and luminous intensity not less than the vertical angle 10° direction from the maximum luminous intensity point is cut, and luminous intensity not more than the vertical angle -45° direction from the maximum luminous intensity point is cut, and luminous intensity not less than the horizontal angle 45° direction from the maximum luminous intensity point is cut, and a beam light flux in a vertical angle ±5° and a horizontal angle ±5° from the maximum luminous intensity point is set so as to have light distribution not less than 54% of the light flux of a luminaire. Luminous intensity not less than the 5° direction is cut, and luminous intensity not more than the vertical angle -30° direction from the maximum luminous intensity point is cut, and luminous intensity not less than the horizontal angle 45° direction from the maximum luminous intensity point is cut, and a beam light flux in a vertical angle ±20° and a horizontal angle ±20° from the maximum luminous intensity point is set so as to have light distribution not less than 78%, of the light flux of the luminaire.