Image pickup apparatus including optical system having refractive surface and reflection surface, and on-board system and moving device provided with same

An image pickup apparatus comprising:

• an optical system;
• and
• an image pickup element configured to perform imaging of an object via the optical system,
• wherein the optical system includes,
• a first refractive surface having a convex shape toward an object side,
• a first reflection surface having a convex shape toward the object side, and
• a second reflection surface having a convex shape toward the object side,
• wherein the first refractive surface is disposed closest to the object with respect to other refractive surfaces included in optical system,
• wherein a light flux travelling through the first refractive surface, the second reflection surface, and the first reflection surface in order from the object side towards an image side,
• wherein a light receiving surface of the image pickup element is disposed at only one side with respect to the optical axis in a first cross section that includes an optical axis of the optical system,
• wherein in the first cross section, when a point A is an intersection closest to the optical axis among intersections between rays traveling from the object side towards the second reflection surface and the first refractive surface, a point B is an intersection closest to the optical axis among intersections between rays traveling from the first reflection surface towards the light receiving surface and an imaginary extension surface of the second reflection surface, and a point C is an intersection between a straight line connecting the point A and the point B and an imaginary extension surface of the light receiving surface, the light receiving surface is disposed at a position that is closer to the optical axis than the point C, and
• wherein the following conditional expression is satisfied:
• 1. 5≤L2/L1≤6.5,
• where L1 is an interval between the first reflection surface and the second reflection surface, and L2 is an interval between the first reflection surface and the light receiving surface.