A solid state image sensor including a pixel region having a plurality of pixels includes at least a photodiode and {HEAD ~ an amplifying portion} amplifying {TAIL ~ photocharges} outputted from the photodiode in the pixel region, and further includes a well electrode for taking well potential of a well region in which the amplifying portion is arranged 
amplifying
A solid state image sensor including a pixel region having a plurality of pixels includes at least a photodiode and { HEAD ~ an amplifying portion } amplifying { TAIL ~ photocharges } outputted from the photodiode in the pixel region , and further includes a well electrode for taking well potential of a well region in which the amplifying portion is arranged
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