photodetectors 4 r 4 g 4 b and 4 d may be arranged highly freely without having to comply with a certain pixel arrangement rule for color filters e g the bayer pattern specifically the photodetection cells in each photodetector 4 may be arranged as shown in fig5 a fig5 a is an upper plan view showing a pixel arrangement in each photodetector 4 of the imaging device of the present embodiment the pixels 16 are arranged so that the centers thereof are at the apices of triangles other than right triangles e g an isosceles triangle abc having equal sides ab and ac or a regular triangle the interspace between two apices along the horizontal direction aa u2032 or bc is equal to a pitch u03bb of the pixels 16 also with respect to the vertical direction the apices are aligned on horizontal lines which are spaced apart by the pitch a note that each pixel 16 corresponds to one photosensitive portion 6 fig5 b illustrates a case where a bright dark pattern having a pitch close to the pitch u03bb of the pixels 16 is projected on the photodetector 4 the pitch of the pattern being 10 u03bb 9 in the illustrated example in a row denoted by arrow 16 a dark lines 13 in the bright dark pattern lie upon the pixels 16 at the right and left ends of fig5 b and lie between pixels 16 in the central portion of fig5 b on the other hand in a row denoted by arrow 16 b the dark lines 13 in the bright dark pattern.