An optical fiber that propagates light over a use wavelength bandwidth of 100 nm or wider in a plurality of propagation modes is provided. The optical fiber has: a confinement loss equal to or less than 1 dB/km in each of the plurality of propagation modes over the use wavelength bandwidth; and a bending loss equal to or less than 100 dB/m in each of the plurality of propagation modes over the use wavelength bandwidth when the optical fiber is bent at a diameter of 20 mm.