An integrated optical device allowing for higher flexibility in designing its outer shape and securing hermetic sealing is provided, which includes a ceramic substrate mounting a light source, a covering member fixed to the substrate for covering the light source, and a resin mold package for attaching the substrate, wherein a metal joint portion on the substrate and a metal joint portion on the covering member are joined, as well as a through-hole in the substrate or in covering member is sealed with a transparent material for hermetic sealing of the light source.