PURPOSE: To sufficiently execute identification from a distant place by forming a bar which is a foldable triangle plate and is mounting a light emitting means to be a flat cube shape.

CONSTITUTION: An alarm triangle plate 100 is constituted of a stand 10, the center bar 10e of the stand has steel and platelike supporting materials 10a-10d which open outwards on both sides and the actual alarm triangle plate is fixed to the center bar and erected. The triangle plate is provided with three leg parts edging an outside and a white plastic sheet fitted inside them and the light emitting cube by the light emitting means is hung from a black bar 13 in the proper clipped part of the plastic sheet. The front surface and the rear surface of the bar are made to be black so as to be opaque and, in the meantime, the respective adjacent surfaces 13b in a horizontal direction are translucent. Thus, the plastic sheet 12 and reflection body leg parts 13 are illuminated and illuminated by light.