a semiconductor optical receiver device is provided , which a mesa comprising a plurality of semiconductor crystal layers formed on a semiconductor substrate including a pn junction having a first conductive semiconductor crystal layer and a second conductive semiconductor crystal layer and including a first contact layer on the semiconductor substrate , a plurality of electrodes to apply electric field to the pn junction are coupled on the semiconductor substrate , a second contact layer is formed on a buried layer in which the mesa is buried , and the electric field is applied to the pn junction through the first and second contact layers .