an optical coherent tomographic image forming apparatus includes : a first switch for instructing rotation of the optical deflection unit at a first speed ; a second switch for instructing rotation of the optical deflection unit at a second speed which is higher than the first speed ; and a driving controller which drives the optical deflection unit rotationally at the first speed in case of detecting instruction operation of the first switch and which changes the rotation speed of the optical deflection unit to the second speed , in case of detecting instruction operation of the second switch , under the condition that the optical deflection unit rotates at the first speed when the second switch is instructionally operated .