PROBLEM TO BE SOLVED: To improve an eyeball image pickup device such that the size of the eyeball and the pupil in an image picked up by the image pickup device becomes constant even if the distance between the image pickup device and the eyeball changes. An eyeball imaging device includes a lens system 11 and an imaging element. The lens system 11 forms image light from the eyeball X located on the front side of the lens system 11 and whose principal ray is parallel to the optical axis on the image pickup surface of the image pickup device. In the figure, Y is an image on the imaging surface. [Selection diagram] FIG.【課題】眼球撮像装置を、撮像素子と眼球の距離が変化しても、撮像素子で撮像された画像中における眼球、瞳孔の大きさが一定となるように改良する。【解決手段】眼球撮像装置は、レンズ系１１と撮像素子とを備える。レンズ系１１は、レンズ系１１の前側に位置する眼球Ｘからの像光であって、その主光線が光軸に平行なものを、撮像素子の撮像面に結像させる。図中Ｙが撮像面上の像である。【選択図】図５
