Abstract: An optical element includes an optical block through which object light is transmitted along a light transmission axis direction, a first wavelength selection filter provided on a first filter surface set such that a normal line forms an angle ? with the light transmission axis, and a second wavelength selection filter located on a rear side with respect to the first wavelength selection filter, and provided on a second filter surface set such that a normal line forms an angle ? with the light transmission axis, the second filter surface being in non-parallel, having an opposite inclination direction, and forming an angle 2? with the first filter surface. The optical block is constituted by combining an incidence-side block, a first filter block, a second filter block, and an emission-side block, formed of the same material and in the same shape.

Abstract: An optical element includes an optical block through which object light is transmitted along a light transmission axis direction, a first wavelength selection filter provided on a first filter surface set such that a normal line forms an angle ? with the light transmission axis, and a second wavelength selection filter located on a rear side with respect to the first wavelength selection filter, and provided on a second filter surface set such that a normal line forms an angle ? with the light transmission axis, the second filter surface being in non-parallel, having an opposite inclination direction, and forming an angle 2? with the first filter surface. The optical block is constituted by combining an incidence-side block, a first filter block, a second filter block, and an emission-side block, formed of the same material and in the same shape.