To provide an optical parts packaging method and optical parts packaging device which are capable of packaging plural optical parts with good accuracy as well as an optical device relating to the optical parts packaging method and optical element packaging device for integrally packaging light emitting elements and optical elements as well as the optical device.

The light emission quantity of the light emission start time of the light emitting elements is measured and the light emission time of the light emitting elements are measured. The light emission quantity of the light emitting elements is calculated in accordance with the light emission quantity of the light emission start time and the light emission time and the positioning of the light emitting elements and the optical elements is performance in accordance with the results of the calculation.