To provide an image data forming method of generating high resolution image data by a technique of pixel staggering without preparing an additional optical moving mechanism within an imaging apparatus, and a components mounting apparatus using it.

In the case of a fine sized component insufficient in recognition at image pick-up in standard resolution (S1 is NO), first, the image pick-up is performed at a reference position (S4); next, a loading head 36 is moved in X direction and Y direction by a half resolution from the reference position (S5). When a size of 1 pixel of imaging device 74 is 7 μm×7 μm, a moving amount F toward X axis and Y axis of the loading head 36 corresponding to 25 μm of the half resolution is 25 μm, and it can be solved by a fine moving function prepared in the loading head 36 originally. High fine image data can be obtained by the technique of pixel staggering in such a way that an image shifted in X axis direction and Y axis direction by the half resolution is picturized (S6), and that the image data of the 2 kinds are composed (S7).