A holding structure 100 for an image pickup device includes a back-incident type image pickup device 1 and a holding member 51 that holds the image pickup element 1, and the image pickup device 1 has an image pickup element 11 that performs imaging and a wiring board 12 electrically connected to the image pickup element 11. The holding member 51 is freely attachably and detachably attached to a side face 27 of the wiring board 12, at each of the opposing side faces 27a, 27a in the wiring board 12, a to-be-fitted portion 28 is formed, and the to-be-fitted portion 28 and a fitting portion 54 formed at the holding member 51 are fitted together. This relieves, even when an impact is applied to the image pickup device 1 during an inspection, delivery, etc., the impact to be applied to the wiring board 12 and the image pickup element 11 by the holding member 51 while suppressing the holding member 51 from coming off. Further, handling of the image pickup device 1 is facilitated, and an unnecessary impact to be applied to the image pickup device 1 is suppressed.