Imaging device and light receiving element

An imaging device according to one embodiment in the present disclosure comprises: a first semiconductor layer having, for each pixel, a photoelectric conversion unit and a charge storing unit that stores a signal charge generated in the photoelectric conversion unit; a second semiconductor layer that is laminated on the first semiconductor layer, has a three-dimensional structure, and has a first surface provided with a pixel transistor that reads the signal charge from the charge storing unit; and a through-wiring that directly connects the charge storing unit and a gate electrode of the pixel transistor.