To control an illuminating zone of a sensor light in order to reduce light pollution to the neighborhood.

The sensor light comprises an illumination section 1 having a lamp and illuminating a fixed zone by irradiating light of the lamp to the fixed zone, a mounting section swingably supporting the illumination section at its upper portion and being mounted on a mounting location, and a sensor section arranged on the mounting section or a lower portion of the mounting section and sensing an invasion object invading into a sensing area. The lamp is turned on when the sensor section senses invasion of the invasion object. A hood member 2 for regulating an irradiating direction of the whole light or a part of the light is detachably arranged. The sensor light can be used while the hood member 2 is mounted on the illumination section 1 or while the hood member 2 is removed from the illumination section 1.