Optical device and method of mounting electronic part

An optical device comprising a laminated substrate in which a plurality of functional layers are laminated, and an optical part and an electronic part disposed on the laminated substrate,

• wherein one of the functional layers is a first functional layer that the optical part is placed one, and one of other of the functional layers is a second functional layer that is disposed below the first functional layer and the electronic part is placed on,
• a first wiring is provided on one surface of the first functional layer and a second wiring is provided on one surface of the second functional layer,
• a connection terminal of the electronic part is electrically connected to both of the first wiring and the second wiring via a conductive material,
• a sub cavity for mounting a component penetrating through the first functional layer is formed in the first functional layer, and the electronic part is placed in the sub cavity for mounting a component,
• in a region exposed from the sub cavity for mounting a component in the second functional layer, a blind hole that is recessed in a thickness direction is formed, and
• a part-fixing-resin layer that is filled in the blind hole and comes into contact with at least a bottom portion of the electronic part is formed.