Optical unit

An optical unit comprising:

• a plurality of lenses;
• an imaging element which receives light transmitted through the plurality of the lenses;
• a circuit board on which the imaging element is mounted;
• a holder comprising a tube part which holds the plurality of the lenses on an inner side;
• and
• a base comprising a holder holding part in a tube shape which holds the holder on an inner side and a circuit board holding part which holds the circuit board;
• wherein an inner peripheral face of the holder holding part comprises a guide part which determines a first center axial line that is a reference,
• an outer peripheral face of the tube part comprises a guided part which determines a second center axial line coincided with an optical axis of the plurality of the lenses,
• the guided part is positioned by the guide part so that the first center axial line and the second center axial line are coincided with each other,
• the circuit board holding part comprises a positioning part with which the circuit board is abutted from an opposite side to an object side,
• at least one of the circuit board holding part and the circuit board comprises a fixed part through which the circuit board is fixed to the circuit board holding part so that a position of the circuit board to the circuit board holding part is capable of being adjusted in a direction perpendicular to the first center axial line,
• an inner peripheral face of the holder holding part is formed with a female screw on the opposite side to the object side with respect to the guide part,
• an outer peripheral face of the tube part is formed with a male screw meshing with the female screw on the opposite side to the object side with respect to the guided part, and
• the plurality of the lenses comprise a cemented lens overlapping with the male screw when viewed in a direction perpendicular to the optical axis.