A breast measurement apparatus comprises a receptacle for surrounding a breast; a plurality of optical fibers for irradiating the breast with examination light and detecting transmitted scattered light from the breast; an inner image generation unit for generating an optical CT image concerning the breast according to a detection signal of the transmitted scattered light; an ultrasonic probe, arranged so as to face the inside of the receptacle, for scanning the breast with an ultrasonic wave and receiving a reflected wave from the breast; an image generation unit for generating an ultrasonic image concerning the breast according to the reflected wave; and a mechanism for injecting and discharging a liquid interface agent into and from the inside of the receptacle.