A translucent member 41 that has been trial-coated with a resin 8 for measurement of a light emission characteristic is placed on a translucent member placement portion 53, an excitation light that excites a phosphor is emitted from a light source unit 42 disposed above, the resin 8 coated on the translucent member 41 is irradiated with the excitation light from above, a deviation between a measurement result obtained by measuring the light emission characteristic of the light emitted from the resin 8, and a light emission characteristic specified in advance is obtained, and an appropriate resin coating amount of the resin to be coated on the LED element for actual production is derived on the basis of the deviation.