To provide an imaging apparatus which enables photographing to be done without being mounted with a lens unit.

In the lens unit 23, a photographing lens 24 and a CCD 25 are housed. A digital camera 10 includes a mount part 12 on the front surface of a camera main body 11 and the lens unit 23 is freely detachably mounted on the mount part 12. Also, on the upper surface of the camera main body 11, an imaging part 19 is arranged near the mount part 12. The imaging part 19 includes a photographing lens 31 and a CCD 32, and a part of the photographing lens 31 is exposed to the outside. Also, the CCD 32 images an object image image-formed by the photographing lens 31. Thus, photographing is performed even in such a state that the lens unit 23 is not mounted. Also, since the photographing lens 31 is not covered even in such a state that the lens unit 23 is mounted, one of the CCDs 25 and 32 is selected and photographing is performed.