In a spectroscopy module 1, a light passing hole 5b through which a light L1 advancing to a spectroscopic portion 4 passes is formed in a light detecting element 5. Therefore, it is possible to prevent the relative positional relationship between the light passing hole 5b and a light detecting portion 5a of the light detecting element 5 from deviating. Moreover, the light to be measured L1 advancing to the spectroscopic portion 4 via the light passing hole 5b and the diffracted lights L2 advancing to the light detecting portion 5a from the spectroscopic portion 4 pass through a void formed between the light detecting element 5 and the substrate 2 by an opening portion 10a of a wiring substrate 10. Therefore, according to the spectroscopy module 1, it is possible to improve the reliability.