A single lens imaging apparatus which generates a stereoscopic image includes a single imaging lens section which is rotatable around an axis along a first direction orthogonal to an optical axis so that a relationship of a position of background with respect to a subject in an optical image is changed. A first driving section rotates the single imaging lens section around the axis. An obtaining section including a moveable imaging element obtains two image signals at different times corresponding to two optical images which respectively pass through the single imaging lens section at different times before and after a rotation thereof by the first driving section and in which the relationship of the position of the background with respect to the subject is different. A generating section generates image data of a stereoscopic image based on the two image signals respectively obtained before and after the rotation.