A sign device capable of improving the luminance and uniformity of a sign surface that emits light by ultraviolet irradiation and enhancing night-time visibility. The sign device comprises a sing body provided with a sign surface that emits light by ultraviolet irradiation, and an irradiation unit for emitting a ultraviolet ray to the sign surface. When a maximum incident angle of a ultraviolet ray shone onto object sign surfaces W1, W2 on the sign surface, as the objects of irradiation by a ultraviolet irradiation lamp, from the lamp of the irradiation unit is theta1 and a minimum irradiation angle is theta2, the angle theta1 is set to be over 30 DEG and under 70 DEG and the angle theta2 to be over 5 DEG and under 30 DEG. |