Also known as: ソフトボックス(ライティング機材)
A soft box is a type of photographic lighting device, one of a number of photographic soft light devices. All the various soft light types create even and diffused Light by directing light through some diffusing material, or by "bouncing" light off a second surface to diffuse the light. The best known form of bouncing source is the umbrella light where the light from the bulb is bounced off the inside of a metalized umbrella to create a soft indirect light.
A soft box is an enclosure around a bulb comprising reflective side and back walls and a diffusing material at the front of the light.