A wide-dynamic-range photodiode-type (PD) active pixel sensor (APS) cell with seamlessly combined logarithmic-linear-logarithmic response is proposed for the first time and its operation is verified by circuit simulation. It has two additional metal-oxide-semiconductor field-effect transistors (MOSFETs) stacked in parallel to the reset MOSFET of conventional three-transistor (3-Tr) PD APS cells. By utilizing our previously proposed operation scheme that achieves automatic linear-logarithmic response switching, the proposed 5-Tr APS cell realizes seamlessly combined logarithmic-linear-logarithmic response.