An optical transceiver includes: a first WDM filter which reflects a first optical signal from a first light source and passes a second optical signal from a second light source; a first total reflection mirror which reflects the first optical signal to make it enter the first WDM filter; a second total reflection mirror which reflects the second optical signal; and a second WDM filter which reflects the second optical signal reflected by the second total reflection mirror to make it enter the first WDM filter. The first and second WDM filters are disposed on a light path, the first and second light sources are disposed back and forth along the light path on both sides thereof, the first and second total reflection mirrors are disposed outside the light path, and an incident angle of the first optical signal to the first WDM filter is smaller than 45 degrees.