A groove-type through hole passing through a silicon layer and a first interlayer insulating film is formed in a region around a chip formation region including a photodiode. In the groove-type through hole, a wall-like wall-type conductive pass-through portion corresponding to the groove-type through hole is formed. An electrode pad is in contact with the wall-type conductive pass-through portion. The electrode pad is electrically connected to a first interconnection through the wall-type conductive pass-through portion.