In a light emitting component, a resistor element is formed on the back surface of a substrate and its resistance value is adjusted to make the light intensity of a light emitting element (LED) in a predetermined range. A constant electric current circuit comprised of the resistor element and a transistor supplies the constant electric current to an LED, and the LED and the transistor are formed on a unit insulating substrate. In the case where the unit insulating substrate is rectangular in shape, one pair of opposite sides are x in length, the other pair of opposite sides are y in length and the ratio value of x/y is in the range of 1-1.25. Further, this light emitting component is provided with two resistor elements and both resistor elements are subjected to a resistor value adjustment.