The purpose of the present invention is to accurately measure and record the diameter of a pupil with minimal error, not only in a medical facility such as a hospital, but also at an emergency medical site outside a medical facility. This pupil diameter measurement assistance device comprises: a device main body that is substantially U-shaped in planar view and that is constituted by a front section arranged in front of both eyes of a person being measured, and side sections arranged so as to sandwich the respective temples of the person being measured from both the left and right sides and a pair of left and right image-capturing sections provided in the front section of the device main body such that the image-capturing sections face the respective eyes of the person being measured. The image-capturing section includes: a visible-light emitting section that emits visible light toward the pupil of the person being measured a near-infrared-light emitting section that emits near-infrared light toward the pupil of the person being measured and a camera section that is provided in the vicinity of the visible-light emitting section and the near-infrared-light emitting section, and that captures an image of the pupil of the person being measured. The visible-light emitting sections, the near-infrared-light emitting sections, and the camera sections are vertically and laterally movable in an integrated manner with respect to both eyes of the person being measured.La présente invention vise à mesurer et enregistrer avec précision le diamètre dune pupille avec une erreur minimale, non seulement dans un établissement médical tel quun hôpital, mais également dans un site médical durgence à lextérieur dun établissement médical. Le dispositif daide de mesures de diamètre de pupille comprend : un corps principal de dispositif qui a sensiblement une forme de U dans une vue en plan, et qui comprend une section avant située en face des deux yeux dune personne à mesurer, et des sect
