An image-pickup apparatus that has a simple structure is disclosed. The image-pickup apparatus includes a linking box provided with a lens mount portion, an image-pickup device unit that receives light that has passed through the lens mount portion, the linking box and a main chassis that is arranged between the linking box and the image-pickup device unit. The main chassis includes an aperture portion through which the light passes. The linking box is fixed to the main chassis, and the image-pickup device unit is fixed to the linking box.