An anterior eye tomographic image capturing apparatus determining a power of an IOL (intraocular lens) is configured to acquire a tomographic image of an anterior eye along a straight line passing through a corneal apex of the anterior eye identify a corneal apex position of the anterior eye, an equator position of a crystalline lens of the anterior eye, and a SS (scleral spur) position of the anterior eye based on the tomographic image calculate an ELP (estimated lens position) based on a first distance from the corneal apex position to the SS position in a direction of a visual axis and a second distance from the SS position to the equator position in the direction of the visual axis and determine the power of the IOL by using the ELP.
