Finder optical system, finder device, and imaging apparatus

A finder optical system comprising:

• a display element;
• and
• an ocular optical system disposed on an eyepoint side with respect to the display element,
• wherein one or more diffraction elements are disposed in the finder optical system,
• at least one of the diffraction elements is a first diffraction element including a liquid crystal diffraction element,
• at least one of the diffraction elements is a second diffraction element including a liquid crystal diffraction element,
• an element having a refractive power is not disposed between a display surface of the display element and the second diffraction element, and
• in a case where a distance on an optical axis from the display surface to a surface of the finder optical system closest to the eyepoint side is denoted by TL,
• a distance on the optical axis from the display surface to an optical surface of the first diffraction element is denoted by X1, and
• a distance on the optical axis from the display surface to an optical surface of the second diffraction element is denoted by X2,
• Conditional Expressions (1) and (4) are satisfied, which are represented by
• 0.05≤X1/TL≤1 (1), and
• 0≤X2/TL<0.05 (4).