Circuit board, endoscope and front end assembly thereof

The invention belongs to the technical field of medical instruments, and particularly relates to a circuit board, an endoscope and a front end assembly of the endoscope. The circuit board is applied to a front end assembly of the endoscope, an electric contact used for being electrically connected with a light source of the endoscope is arranged on the circuit board, the circuit board is provided with a shading part, a first space and a second space are formed in the two opposite sides of the shading part respectively, the first space is used for containing a part of a camera module, and the second space is used for containing a part of the camera module. The second space is used for accommodating at least part of the light-emitting part of the light source. In practice, the shading part is located between the light source and the camera module, so that at least part of light emitted by the light source and emitted to the camera module can be shaded by the shading part, the light directly emitted to the camer