A camera includes a camera-unit rotatably held which can change its photographing direction by rotation, and a rotation detecting device for detecting the rotation. The rotation detecting device includes: a detection part having a lever which self-returns to a reference position; a cam part, with which the lever part is contact, including a cut-out part in a part thereof; and a rotary body rotatable together with the camera-unit. In one-directional rotation about a shaft, the rotary body transitions at least among a first state of the lever not facing the cut-out part, a second state of the lever facing the cut-out part at the reference position, and a third state of the lever not facing the cut-out part. The detection part detects which one of the first, second, and third states the rotary body is in, and determines the photographing direction of the camera-unit based on the detected state.