Optical unit and imaging apparatus

An imaging apparatus comprising:

• an imaging device;
• and
• an optical unit that forms a subject image on the imaging device,
• wherein the optical unit includes at least first and second lens groups of the first and second lens groups and a third lens group disposed in order from an object side toward an image surface side,
• the first lens group includes a bonding body of at least two first and second lens elements, a transparent body, and a third lens element that are disposed in order from the object side toward the image surface side, and
• in the bonding body, the first and second lens elements are formed of resin materials having different temperature refractive index changes.

An imaging apparatus comprising:

• an imaging device;
• and
• an optical unit that forms a subject image on the imaging device,
• wherein the optical unit includes at least one lens element with positive power and at least one lens element with negative power that are disposed in order from an object side toward an image surface side, are formed of at least two or more resin materials having different temperature refractive index changes, and overlap each other on a curved surface, and
• the temperature refractive index change (|dn/dt|) of the lens element with positive power is smaller than the temperature refractive index change (|dn/dt|) of the lens element with negative power by at least 0.1×10−4 [1/deg].