An optical receiver that can tune a selected wavelength using a wavelength tunable filter transmitting a plurality of wavelengths. The optical receiver is a wavelength tunable optical receiver that includes: a wavelength tunable filter (100) transmitting laser light from an optical fiber; and a photodiode (300) receiving laser light passing through the wavelength tunable filter (100), in which the wavelength tunable filter 100 is a Fabry-Perot type etalon filter transmitting a plurality of wavelengths. When a channel with a specific wavelength is moved to a channel with another wavelength, an optical channel is selected based on a peak different from a transmissive peak of an FP etalon filter selecting the previous channel so that temperature of the wavelength tunable filter can be changed. A light-receiving photodiode chip is disposed on a thermoelectric element and a wavelength tunable filter transmits different wavelengths in accordance with temperature of the thermoelectric element.