Optical transmitting module and optical transmitting device

An optical transmitting module having an optical transmitting package of a coaxial type and a line board which is connected to the optical transmitting package, wherein

• the optical transmitting package comprises:
• a semiconductor laser element;
• an optical modulator unit which modulates, based on an input signal, light which is output from the semiconductor laser element;
• and
• a conductor board which is electrically connected to the semiconductor laser element and the optical modulator unit,
• a drive current supply line which supplies a drive current to the semiconductor laser element and a common ground line which electrically connects the conductor board and a common ground are formed over the line board, and
• a signal attenuation circuit which attenuates a signal which is output from the optical modulator unit and which has one end electrically connected to the common ground line and the other end electrically connected to the drive current supply line is provided over the line board.