Provided are an imaging device, an endoscope, and an endoscope system that can realize further miniaturization. The imaging element is provided in each of the plurality of unit pixels 230, the plurality of first transfer lines 237 that transfer the imaging signals, and the plurality of first transfer lines 237, respectively. A constant current source 238 to be output to the transfer line 237 and a plurality of first current lines 237 that form a capacitance with each of the plurality of first transfer lines 237 and transfer the imaging signals output from the first transfer line 237, respectively. The second transfer line 239, the vertical scanning unit 241 and the horizontal scanning unit 244 for reading out the imaging signals transferred by the plurality of second transfer lines 239, and the vertical scanning unit 241 while outputting the imaging signals to the unit pixels 230. And a timing generation unit 25 that operates the horizontal scanning unit 244.さらなる小型化を実現することができる撮像素子、内視鏡および内視鏡システムを提供する。撮像素子は、複数の単位画素２３０と、撮像信号をそれぞれ転送する複数の第１の転送線２３７と、複数の第１の転送線２３７それぞれに設けられ、単位画素２３０から撮像信号を第１の転送線２３７に出力させる定電流源２３８と、各々が複数の第１の転送線２３７のいずれかと対をなして容量を形成し、第１の転送線２３７が出力する撮像信号をそれぞれ転送する複数の第２の転送線２３９と、複数の第２の転送線２３９が転送する撮像信号を読み出す垂直走査部２４１と水平走査部２４４と、単位画素２３０に撮像信号を出力させたまま垂直走査部２４１と水平走査部２４４を動作させるタイミング生成部２５と、を備える。
