Provided are: an image acquiring device and a biological information acquiring device which are capable of reducing the effect of stray light that does not contribute to imaging and capable of acquiring clear image information and an electronic apparatus that uses the image acquiring device and the biological information acquiring device. The image acquiring device is provided with: an imaging section 140 having light-receiving elements 142 a light-shielding section 130 a light-collecting section 120 and a light-emitting section having a light-emitting element. The light-shielding section 130 has a transparent substrate 131, a light-shielding layer 132, and opening sections 133 provided in the light-shielding layer 132. A light-transmission layer 125 having a smaller refractive index than the refractive index of the substrate 131 of the light-shielding section 130 is provided between the light-collecting section 120 and the light-shielding section 130. When the diameter of a light-receiving surface 142a of the light-receiving elements 142 is d, the diameter of the opening sections 133 is a, the arrangement pitch of the light-receiving elements 142 is p, the refractive index of the light-transmission layer 125 is n1, the refractive index of the substrate 131 is n2, and the distance between the light-receiving elements 142 and the light-shielding layer 132 is h, the following equation is satisfied: Arctan((p-a/2-d/2)/h) ≥ Arcsin(n1/n2)Linvention concerne : un dispositif dacquisition dimage et un dispositif dacquisition dinformations biologiques qui sont capables de réduire leffet de la lumière parasite qui ne contribue pas à limagerie et capables dacquérir des informations dimage claire et un appareil électronique qui utilise le dispositif dacquisition dimage et le dispositif dacquisition dinformations biologiques. Le dispositif dacquisition dimage est pourvu : dune section dimagerie (140) ayant des éléments de réception de lumière (142) dune section de protection c
