Indicating lamp

An indicating lamp emitting light radially toward a periphery of a central axis and away from the central axis and comprising:

• three LED substrates that, when viewed in parallel to the central axis, form an equilateral triangle surrounding the central axis and are disposed equidistantly with respect to the central axis;
• LEDs that, when viewed in parallel to the central axis, are disposed on an outer surface of each LED substrate at least one each at each of a pair of placement positions at both sides sandwiching a reference normal being a normal to the outer surface of each LED substrate and passing through the central axis and each have an optical axis orthogonal to the outer surface of each LED substrate;
• and
• an optical system by which, when viewed in parallel to the central axis, radiated lights from the LEDs at the pair of placement positions of each LED substrate are converted to and emitted as emitted parallel lights that are respectively parallel to a pair of light emission reference lines passing through the central axis at both sides sandwiching the reference normal of each LED substrate and respectively contain the corresponding light emission reference lines.