A bilirubin concentration measurement system, comprising: a sensor device attachable to a subject; and a terminal device capable of wirelessly communicating with the sensor device, wherein the sensor device comprises: a first light emitting element that emits light in a first wavelength band at a first timing; a second light emitting element that emits light in a second wavelength band at a second timing; a light detection element that detects first reflected light that is the light in the first wavelength band having been incident on skin of the subject and been reflected at the first timing, and detects second reflected light that is the light in the second wavelength band having been incident on the skin of the subject and been reflected at the second timing; and a first communication unit that wirelessly transmits information about intensities of the first and second reflected light detected by the light detection element, and the terminal device comprises: a second communication unit that receives the information about the intensities of the first and second reflected light transmitted from the first communication unit; and a computing unit that calculates a bilirubin concentration using the information about the intensities of the first and second reflected light, wherein: the light detection element detects, multiple times, each of the first and second reflected light at the first and second timings, and the computing unit applies predetermined statistical processing to data corresponding to the intensities of the first and second reflected light detected multiple times, and calculates the bilirubin concentration selectively using data in a predetermined range among the statistically processed data corresponding to the intensities of the first and second reflected light. a first light emitting element that emits light in a first wavelength band at a first timing; a second light emitting element that emits light in a second wavelength band at a second timing; a light detection element that detects first reflected light that is the light in the first wavelength band having been incident on skin of the subject and been reflected at the first timing, and detects second reflected light that is the light in the second wavelength band having been incident on the skin of the subject and been reflected at the second timing; and a first communication unit that wirelessly transmits information about intensities of the first and second reflected light detected by the light detection element, and the terminal device comprises: a second communication unit that receives the information about the intensities of the first and second reflected light transmitted from the first communication unit; and a computing unit that calculates a bilirubin concentration using the information about the intensities of the first and second reflected light, wherein: the light detection element detects, multiple times, each of the first and second reflected light at the first and second timings, and the computing unit applies predetermined statistical processing to data corresponding to the intensities of the first and second reflected light detected multiple times, and calculates the bilirubin concentration selectively using data in a predetermined range among the statistically processed data corresponding to the intensities of the first and second reflected light. a second communication unit that receives the information about the intensities of the first and second reflected light transmitted from the first communication unit; and a computing unit that calculates a bilirubin concentration using the information about the intensities of the first and second reflected light, wherein: the light detection element detects, multiple times, each of the first and second reflected light at the first and second timings, and the computing unit applies predetermined statistical processing to data corresponding to the intensities of the first and second reflected light detected multiple times, and calculates the bilirubin concentration selectively using data in a predetermined range among the statistically processed data corresponding to the intensities of the first and second reflected light. the light detection element detects, multiple times, each of the first and second reflected light at the first and second timings, and the computing unit applies predetermined statistical processing to data corresponding to the intensities of the first and second reflected light detected multiple times, and calculates the bilirubin concentration selectively using data in a predetermined range among the statistically processed data corresponding to the intensities of the first and second reflected light.