Provided is a transistor outline (TO)-CAN type optical module and an optical transmission apparatus including the same. The optical module includes a stem, a thermo-electric cooler (TEC) on the stem, a first sub-mount on the TEC, an optical element on the first sub-mount, a plurality of electrode lead wirings inserted from an outside to an inside of the stem and disposed adjacent to the TEC and the optical element, a second sub-mount between the electrode lead wirings and the optical element, radio frequency (RF) transmission lines on the second sub-mount, a plurality of bonding wires connecting the RF transmission lines and the optical element, and the RF transmission lines and the electrode lead wirings, and an impedance matching unit disposed around the RF transmission lines and the electrode lead wirings, and controlling impedances of the RF transmission lines and the electrode lead wires.