Image sensing device including conversion gain capacitor

Image sensing devices are disclosed. An image sensing device includes a first pixel group including a plurality of first image sensing pixels to convert light into electrical charges and a first conversion gain transistor coupled to the plurality of first image sensing pixels, a second pixel group including a plurality of second image sensing pixels to convert light into electrical charges and a second conversion gain transistor coupled to the plurality of second image sensing pixels, the second pixel group disposed adjacent to the first pixel group, and a conversion gain capacitor to electrically couple the first conversion gain transistor to the second conversion gain transistor to provide a capacitance to the first and second image sensing pixels. The conversion gain capacitor comprises a first conductive line to include a region having a ring type shape and a second conductive line disposed adjacent to the first conductive line.