The solid-state image pick-up device (1) includes a photodetecting section (10) which is formed by two-dimensionally aligning M×N (M and N are integers not less than 2) pixels in M rows and N columns and has a rectangular photodetecting surface. This solid-state image pick-up device (1) is supported rotatably by a rotation controlling section, and the rotation controlling section controls the rotation angle of the solid-state image pick-up device (1) so that the row direction or column direction of the photodetecting section (10) becomes parallel to the movement direction (B) of the solid-state image pick-up device (1) in one of the two imaging modes, and both of the row direction and the column direction of the photodetecting section (10) tilt with respect to the movement direction (B) of the solid-state image pick-up device (1) in the other imaging mode of the two imaging modes.
