LENS UNIT AND IMAGING APPARATUS

To provide a lens unit in which the surface distortion of a lens can be reduced, the surface distortion occurring during fixing of the lens to a lens holding frame.SOLUTION: A lens unit (100) includes a lens (102) and a lens holding frame (101), the lens has a first outer diameter portion (109) and a second outer diameter portion (110), the lens holding frame has a first cylindrical portion (104), a second cylindrical portion (107), a flange portion (108) and an abutment portion (106), a press-in portion (105) is provided in the first cylindrical portion. The gravity center (x1) in an optical axis direction, of the lens is positioned within the range of a contact region (A) of the press-in portion with the first outer diameter portion, a difference y1 between the first outer diameter portion and the second outer diameter portion and a difference B between the radius of the first outer diameter portion and the radius of tip of the abutment portion (103) for pressing the lens from the side which is reverse to the abutment portion satisfy the conditional expression 0