To provide an electric heat source device using both convection and radiation.

This convection radiation heat source device is arranged with a semiconductor heating-functional element as a heat source on at least one side face of the opposed side faces in an air flow passage provided in a device main body, and is provided with a heat radiation material additionally to the semiconductor heating-functional element. The convection radiation heat source device is not only favorable for the human being and an environment, but also reduced in electric power consumption and also has a long service life, because heat energy generated in the semiconductor heating-functional element is converted into radiation heat and convection heat to be used in combination, and is used as a safe heat source device.