An optical fiber sensing system according to the present disclosure includes clothing (10) including an optical fiber (20), an optical fiber sensing unit (31) configured to receive an optical signal from the optical fiber (20), and acquire, based on the optical signal, a plurality of parameters each having a pattern according to a state of a person wearing the clothing (10), and a state detection unit (32) configured to detect a state of a person wearing the clothing (10), based on a pattern contained in each of the plurality of parameters.